Make read lock API more Base-like

[tkf]

No description provided.

[codecov]

Codecov Report

Merging #41 (ffb23a1) into main (ea0a68e) will not change coverage.
The diff coverage is 61.53%.

❗ Current head ffb23a1 differs from pull request most recent head c48c80f. Consider uploading reports for the commit c48c80f to get more accurate results

@@           Coverage Diff           @@
##             main      #41   +/-   ##
=======================================
  Coverage   81.53%   81.53%           
=======================================
  Files           9        9           
  Lines         222      222           
=======================================
  Hits          181      181           
  Misses         41       41           

Flag	Coverage Δ
Pkg.test	81.53% <61.53%> (ø)

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Impacted Files	Coverage Δ
src/ConcurrentUtils.jl	100.00% <ø> (ø)
src/read_write_lock.jl	78.68% <33.33%> (ø)
src/lock_interface.jl	90.00% <83.33%> (ø)
src/guards.jl	90.47% <100.00%> (ø)

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