Add GenericCreator for loading SSL certs in processes

[ahopkins]

Resolves #2577

[codecov]

Codecov Report

Base: 88.041% // Head: 88.047% // Increases project coverage by +0.006% 🎉

Coverage data is based on head (e7b6561) compared to base (3f4663b).
Patch coverage: 54.545% of modified lines in pull request are covered.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #2578       +/-   ##
=============================================
+ Coverage   88.041%   88.047%   +0.006%     
=============================================
  Files           71        71               
  Lines         5335      5338        +3     
  Branches       893       893               
=============================================
+ Hits          4697      4700        +3     
  Misses         461       461               
  Partials       177       177               

Impacted Files	Coverage Δ
sanic/worker/loader.py	91.549% <54.545%> (-4.039%)	⬇️
sanic/server/websockets/impl.py	38.061% <0.000%> (+0.709%)	⬆️

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[ahopkins]

This pull request has been mentioned on Sanic Community Discussion. There might be relevant details there:

https://community.sanicframework.org/t/unknown-certificate-creator-error/1090/2