Reload interval on class variable

[ahopkins]

Replaces #2567 by moving the interval to the class so that it is possible to configure, but does not bloat the config namespace.

from sanic.worker.reloader import Reloader

Reloader.INTERVAL = 5.0

[codecov]

Codecov Report

Base: 88.539% // Head: 88.555% // Increases project coverage by +0.016% 🎉

Coverage data is based on head (573fe95) compared to base (0e44e9c).
Patch coverage: 100.000% of modified lines in pull request are covered.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #2633       +/-   ##
=============================================
+ Coverage   88.539%   88.555%   +0.016%     
=============================================
  Files           81        81               
  Lines         6701      6702        +1     
  Branches      1143      1143               
=============================================
+ Hits          5933      5935        +2     
+ Misses         529       528        -1     
  Partials       239       239               

Impacted Files	Coverage Δ
sanic/mixins/startup.py	91.196% <100.000%> (ø)
sanic/worker/reloader.py	97.101% <100.000%> (+0.042%)	⬆️
sanic/http/http1.py	84.246% <0.000%> (+0.684%)	⬆️

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