chore: move EventSender out of BeaconConsensusEngineHandle

[klkvr]

EventSender needs primitives generic which leaks it into some types which operate exclusively on EngineTypes

it is not used anywhere so decided to just remove from here for now

[codspeed-hq]

CodSpeed Performance Report

Merging #13533 will not alter performance

_{Comparing klkvr/move-engine-sender (6e1a8d8) with main (8579c08)}

Summary

✅ 73 untouched benchmarks
🆕 4 new benchmarks
⁉️ 4 dropped benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	klkvr/move-engine-sender	Change
🆕	`prefix set	preload size: 1000	input size: 1000	BTreeSet with BTreeSet:range lookup`
🆕	`prefix set	preload size: 1000	input size: 1000	BTreeSet with Iterator:any lookup`
🆕	`prefix set	preload size: 1000	input size: 1000	Vec with binary search lookup`
🆕	`prefix set	preload size: 1000	input size: 1000	Vec with custom cursor lookup`
⁉️	`prefix set	preload size: 1000	input size: 999	BTreeSet with BTreeSet:range lookup`
⁉️	`prefix set	preload size: 1000	input size: 999	BTreeSet with Iterator:any lookup`
⁉️	`prefix set	preload size: 1000	input size: 999	Vec with binary search lookup`
⁉️	`prefix set	preload size: 1000	input size: 999	Vec with custom cursor lookup`

[mattsse]

yeah, this is a lot better