[stdlib] _CharacterRecognizer: Add Sendable, Equatable, CustomStringConvertible conformances #62897
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Equatability allows faster implementations for updating cached grapheme boundary state after a text mutation, because it enables quick detection of before/after state equality, without having to feed the recognizers until they produce a synchronized grapheme break.
The CustomStringConvertible conformance makes it orders of magnitude more pleasant to debug code that uses this.
Sendable is a baseline requirement for value types these days.
rdar://103903565