fix(yamux): add concurrency lock to YamuxStream to prevent data corruption

[sujalsalekar]

Description

This pull request introduces a critical enhancement to the concurrency model of the Yamux stream muxer in py-libp2p. The update addresses a race condition where concurrent read and write operations on the same YamuxStream instance could interleave, resulting in data corruption and unpredictable protocol behavior.

Summary of Changes

• Introduced a dedicated asynchronous read/write lock (self.rw_lock) to the YamuxStream class.
• Both the read and write methods are now protected by this lock, ensuring that only one coroutine can access these methods at a time for a given stream.
• This approach aligns the concurrency safety of Yamux with the existing pattern used in the Mplex stream muxer.

Impact

• Prevents data races and corruption in Yamux streams.
• Improves the stability and reliability of all protocols built on top of the stream muxer.
• Brings the concurrency model of Yamux in line with best practices and other muxer implementations.