Replace deprecated distutils.strtobool

[kijk2869]

Fix #2388

Because setup.py also uses the function, code duplication inevitably occurred.
If there is a better solution, please suggest.

[codecov]

Codecov Report

Base: 88.548% // Head: 88.489% // Decreases project coverage by -0.059% ⚠️

Coverage data is based on head (0a1a1d2) compared to base (71d3d87).
Patch coverage: 100.000% of modified lines in pull request are covered.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #2628       +/-   ##
=============================================
- Coverage   88.548%   88.489%   -0.060%     
=============================================
  Files           81        81               
  Lines         6698      6698               
  Branches      1143      1143               
=============================================
- Hits          5931      5927        -4     
- Misses         529       531        +2     
- Partials       238       240        +2     

Impacted Files	Coverage Δ
sanic/server/loop.py	57.692% <100.000%> (ø)
sanic/server/websockets/impl.py	37.557% <0.000%> (-0.922%)	⬇️

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[ahopkins]

Duplication is 👌