Locking api changes

[pedromfedricci]

BREAKING

• Renamed Mutex::lock to Mutex::lock_with, to better communicate that it requires a MutexNode allocation from caller.

Added

• New Mutex::lock method, this one transparently allocates a node, so that it does not take a MutexNode parameter.
• New Mutex::lock_then method, which does not take a node parameter, but takes a closure with a single MutexGuard parameter and returns a generic value.
• New Mutex::lock_with_then method, which does take a node parameter, and also a closure with a single MutexGuard parameter and returns a generic value.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 68.75000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 97.19%. Comparing base (7eb23b2) to head (5b399cd).

Files with missing lines	Patch %	Lines
src/raw/mutex.rs	64.28%	5 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##              main       #5      +/-   ##
===========================================
- Coverage   100.00%   97.19%   -2.81%     
===========================================
  Files            5        5              
  Lines          157      178      +21     
===========================================
+ Hits           157      173      +16     
- Misses           0        5       +5     

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