Add DynamoStore, EventStoreDb, MessageDb, eqx query, LoadOption.AllowStale, DeciderCore; Update to FsCodec 3.0 JsonElement/ReadOnlyMemory event bodies

This release is about 3 major versions in one (as evidenced by 1 alpha, 12 beta, 17 rc and multiple interim nuget releases!)

Major new features:

• DynamoStore: Full ground-up store implementation (including indexing/changefeed in the Propulsion.DynamoStore.* packages), using FSharp.AWS.DynamoDB 🙏 @ameier38 @epNickColeman @samritchie
• EventStoreDb: Replacement for the EventStore package (which uses the deprecated EventStore DB TCP/IP protocol) that uses their modern gRPC stack 🙏 @oskardudycz @thefringeninja @keppelerj
• MessageDb: Full ground-up store implementation for PostgreSQL based on Message DB with strong Open Telemetry support (that will eventually be implemented similarly across the board) 🙏 @nordfjord
• LoadMode.AllowStale: Support for bounded staleness (and limiting concurrent reads), enabling use for non-trivial read activity without having to adhere to strict CQRS separation and/or eventual consistency 🙏 @brihadish
• DeciderCore: C#-optimized API (arrays, Func, Task<T>, ValueTuple etc)
• Internal rewrite for performance, replacing usage of F# async with task, and AsyncSeq with [TaskSeq](https://github.com/fsprojects/fsharp.control.taskseq] 🙏 @abelbraaksma
• CosmosStore supports hydrating streams based on queries for Tip documents from across streams (i.e. you can now efficiently render a paged list of items based on search criteria against the snaphot's state in the Tip, in addition to the existing individual stream APIs) @brihadish @raghuAtRA
• CosmosStore internal implementation is now entirely based on System.Text.Json, with no internal Newtonsoft.Json usage) @ylibrach
• significant naming and structural influences based on the EquinoxJS project instigated by by
  Einar Norðfjörð 🙏 @nordfjord

API changes summary:

• All packages require net6.0 (i.e. it works seamlessly with NET 6.0 and and later, but there is no longer any netstandard2.0 support)
• Relies on FsCodec v3's
• FsCodec.StreamId (replacing the lower-level StreamName abstraction), streamlining how identity types get mapped to stream names
• Migrates from byte[] Event Bodies to System.ReadOnlyMemory<byte>
• Category base class enables significantly simpler wiring (see Factory/Store.Config structure in /samples and dotnet-templates
• Clearer Category APIs (e.g. name is passed to the constructor)
• Removal usage of F#-specific and/or otherwise deprecated types from the public interfaces:
• FSharpFunc->Func
• System.Tuple->System.ValueTuple
• list/seqs of events as returned from Decision functions are now arrays

Added

• Equinox: Decider.Transact, TransactEx overloads #325
• Equinox.LoadOption.RequireLeader: support for requesting a consistent read of a stream #341
• Equinox.LoadOption.AllowStale: Read mode that limits reads to a maximum of one retrieval per the defined time window #386
• Equinox.Category base class, with Decider and Stream helper modules #337
• Equinox.DeciderCore: C# friendly equivalent of Decider (i.e. Func and Task) #338
• Equinox.ISyncContext.StreamEventBytes: Exposes stored size of events in the stream (initial impl provides it for DynamoStore only) #326
• Equinox.Core.Batching: BatcherDictionary, BatcherCache to host concurrent Batchers #390
• Equinox.Core.Batching: Add limiter: SemaphoreSlim argument to extend linger phase #427
• CosmosStore.CosmosStoreConnector: Connect, ConnectAsync #421
• CosmosStore.Exceptions: Active patterns to simplify classification in the context of Propulsion handlers #416
• CosmosStore.Prometheus: Add rut tag to enable filtering/grouping by Read vs Write activity as per DynamoStore #321
• DynamoStore/DynamoStore.Prometheus: Implements the majority of the CosmosStore functionality via FSharp.AWS.DynamoDB #321
• EventStore: Revise test rig to target a Docker-hosted cluster #317
• EventStoreDb: As per EventStore module, but using the modern EventStore.Client.Grpc.Streams client #196
• MessageDb: Implements a message-db storage backend #339 with OpenTelemetry tracing and snapshotting support #348 🙏 @nordfjord
• eqx init --indexUnfolds cosmos: enables querying uncompressed unfolds (see shouldCompress) #434
• eqx query cosmos: Queries based on uncompressed unfolds (see eqx init -U) #434
• eqx query -o FILEPATH cosmos: Allows capture of raw JSON to a file #444
• eqx dump: -s flag is now optional
• eqx stats: -A flag to request all stats (equivalent to requesting -ESD) #424

Changed

• Change surface APIs that use Tuples and Options to struct equivalents. Some due to struct changes in FsCodec #82, and use task in hot paths #337
• Change surface APIs that use'event list or 'event seq to 'event[] #411
• Raise FSharp.Core req to 6.0.7, framework req to net6.0 #310 #337 #33 #411
• Replace AsyncSeq usage with FSharp.Control.TaskSeq v 0.4.0 #361 #391
• Equinox: Move Serilog dependency from Decider constructor to Category/Decider.forStream #337 #419
• Equinox: FsCodec.StreamId replaces usage of FsCodec.StreamName #353 #378 #419
• Equinox.ResolveOption: rename to LoadOption #308 #413
• Equinox.LoadOption: Rename AllowStale to AnyCachedValue #386
• Equinox.Decider: Replace 'event list with 'event[] #411
• Equinox.Decider: Replace maxAttempts with a default policy and an optional argument on Transact* APIs #337
• Equinox.Decider: rename Decider.TransactAsync, Decider.TransactExAsync to Transact #314
• Equinox.Core.AsyncBatchingGate: renamed to Batching.Batcher #390
• Equinox.Core.AsyncCacheCell: renamed to TaskCell #433
• Equinox.Core: Now a free-standing library that a) does not depend on Equinox b) is not depended on by the Stores (though CosmosStore inlines TaskCell) #420
• Stores: Change Event Body types, requiring FsCodec v 3.0.0, with EventBody types switching from byte[] to ReadOnlyMemory<byte> and/or JsonElement see FsCodec#75 #323
• Stores: *Category.Resolve: Replace Resolve(sn, ?ResolveOption, ?requestContext) with ?load = LoadOption parameter on all Transact and Query methods, and Decider.forStream/Decider.forRequest to convey request context #308
• Stores: *Category ctor: Add mandatory name argument, and Name property #410
• Stores: *Category ctor: Change fold to be a Func (no changes to F# code required) #421
• Stores: *Category ctor: Change caching to be last argument, to reflect that it is applied over the top #410
• Stores: *Category ctor: Change caching and access to be mandatory, adding NoCaching and Unoptimized modes to represent the former defaults #417
• CosmosStore: Require Microsoft.Azure.Cosmos v 3.35.4 #310
• CosmosStore: Switch to natively using JsonElement event bodies #305 🙏 @ylibrach
• CosmosStore: Switch to natively using System.Text.Json for serialization of all Microsoft.Azure.Cosmos round-trips #305 🙏 @ylibrach
• CosmosStore: Only log bytes when log level is Debug #305
• CosmosStore.AccessStrategy.MultiSnapshot,Custom: Change list and seq types to array #338
• CosmosStore.CosmosStoreCategory: Generalize compressUnfolds to shouldCompress predicate #436
• CosmosStore.CosmosStoreCategory.TryHydrateTip: Generates a Stream State Momento based on externally loaded unfold state #434
• CosmosStore.CosmosStoreCategory.TryLoad: Renders a 'state based on an Unfold #434
• CosmosStore.Core.Initialization.initAux: Replace hard-coded manual 400 RU with mode parameter #328 🙏 @brihadish
• CosmosStore.CosmosClientFactory: Moved to Core #430
• EventStore: Target EventStore.Client v 22.0.0; rename Connector -> EventStoreConnector #317
• Tool/samples/: switched to use Equinox.EventStoreDb #196

New Contributors

• @ameier38 was instrumental in the design and implementation of DynamoStore and many programming model advancements in V4
• @brihadish made their first contribution in #328 and was key to the development of the concept of the bounded staleness AllowStale mode
• @epNickColeman made their first contribution in #337 and drove #401; DynamoStore has correct ordering semantics thanks to major efforts on his part
• @keppelerj made their first contribution in #371
• @nordfjord made their first contribution in #339, added and polished the MessageDb store and was a huge impetus behind pretty much all positive changes in v4

Old contributors

• The DDD-CQRS-ES community are the reason this project exists and continues. Countless people influenced design decisions in this release directly and indirectly
• Multiple employers and colleagues over the course of the V4 development have provided boundless tolerance and support for always doing the right thing

Full Changelog: 3.0.7...4.0.0