Add CertLoader as application option

[ahopkins]

Closes #2655

from sanic.worker.loader import CertLoader


class MyCertLoader(CertLoader):
    def load(self, app: Sanic) -> SSLContext:
        ...


app = Sanic(..., certloader_class=MyCertLoader)

[codecov]

Codecov Report

Patch coverage: 100.000% and project coverage change: +0.170 🎉

Comparison is base (a245ab3) 88.617% compared to head (0ac462f) 88.788%.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #2722       +/-   ##
=============================================
+ Coverage   88.617%   88.788%   +0.170%     
=============================================
  Files           87        87               
  Lines         6844      6850        +6     
  Branches      1178      1179        +1     
=============================================
+ Hits          6065      6082       +17     
+ Misses         537       530        -7     
+ Partials       242       238        -4     

Impacted Files	Coverage Δ
sanic/app.py	90.102% <100.000%> (+0.033%)	⬆️
sanic/worker/loader.py	94.666% <100.000%> (+3.117%)	⬆️
sanic/worker/serve.py	98.571% <100.000%> (+7.142%)	⬆️

... and 1 file with indirect coverage changes

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