feat: add MutexMap.RLock

[moul]

No description provided.

[github-actions]

Expected release notes (by @moul-bot)

features:
add MutexMap.RLock (ee3f78d)

• I hereby acknowledge these release notes are 🥙 AWESOME 🥙

[codecov]

Codecov Report

Merging #61 (ee3f78d) into master (0c2188f) will decrease coverage by 2.07%.
The diff coverage is 18.18%.

@@            Coverage Diff             @@
##           master      #61      +/-   ##
==========================================
- Coverage   74.12%   72.04%   -2.08%     
==========================================
  Files          15       15              
  Lines         313      322       +9     
==========================================
  Hits          232      232              
- Misses         49       58       +9     
  Partials       32       32              

Flag	Coverage Δ
unittests	72.04% <18.18%> (-2.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sync.go	50.00% <18.18%> (-50.00%)	⬇️

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[github-actions]

🎉 This PR is included in version 1.27.0 🎉

The release is available on GitHub release

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