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✨ Cache server capabilities; add #capable?(name)
Updated methods: * `#initialize` - save capabilities in `OK` or `PREAUTH` greeting * `#capability` - always update saved capabilities * `#starttls` - always clear capabilities after tagged OK response * `#authenticate` - clear capabilities or update from tagged OK response * `#login` - clear capabilities or update from tagged OK response New methods: * `#capable?(name)` - the primary API for discovering capabilities * `#auth_capable?(name)` - returns whether a SASL mechanism is supported * `#capabilities` - calls `capability` when needed * `#capabilities_cached?` - whether capabilities are cached * `#clear_cached_capabilities` - clears the cache Fixes #31
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