Add barging mutex a 2nd relax param

[pedromfedricci]

Breaking changes:

• mcslock::barging::Mutex now has two generic parameters for its relax strategies: Rs and Rq. The first generic parameter refers to the shared lock relax strategy during contention. The second refers to the queue's lock hand-off relax strategy. The most common pattern is to use a backoff relax strategy for the shared lock, while keeping a non-backoff relax strategy for the handoffs.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.02%. Comparing base (dbde0cc) to head (419317a).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #15      +/-   ##
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- Coverage   99.51%   99.02%   -0.49%     
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  Files           5        5              
  Lines         205      205              
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- Hits          204      203       -1     
- Misses          1        2       +1     

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