Add value accessor methods to Mutex and RwLock

[EFanZh]

• ACP: Add get, set and replace methods to Mutex and RwLock libs-team#485.
• Tracking issue: Tracking Issue for lock_value_accessors #133407.

This PR adds get, set and replace methods to the Mutex and RwLock types for quick access to their contained values.

One possible optimization would be to check for poisoning first and return an error immediately, without attempting to acquire the lock. I didn’t implement this because I consider poisoning to be relatively rare, adding this extra check could slow down common use cases.