sync: add Map.CompareAndSwap and Map.CompareAndDelete#5394
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These methods were added in Go 1.20 but were missing from TinyGo's sync.Map implementation, causing compilation failures for code that uses them. The implementation follows the same lock-based approach as the rest of TinyGo's sync.Map.
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Fixes #3754
I forgot to send this PR yesterday and remembered when I read #5386 (comment)