Add interval sleep in reloader

[ahopkins]

Meant to fix #2566 until discussion in #2567 is complete.

[codecov]

Codecov Report

Base: 88.093% // Head: 88.097% // Increases project coverage by +0.004% 🎉

Coverage data is based on head (09e3da3) compared to base (1c4925e).
Patch coverage: 100.000% of modified lines in pull request are covered.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #2595       +/-   ##
=============================================
+ Coverage   88.093%   88.097%   +0.004%     
=============================================
  Files           71        71               
  Lines         5333      5335        +2     
  Branches       893       893               
=============================================
+ Hits          4698      4700        +2     
  Misses         459       459               
  Partials       176       176               

Impacted Files	Coverage Δ
sanic/http/tls/creators.py	95.614% <ø> (ø)
sanic/mixins/startup.py	91.898% <ø> (ø)
sanic/server/socket.py	100.000% <ø> (ø)
sanic/types/shared_ctx.py	100.000% <ø> (ø)
sanic/worker/reloader.py	97.058% <100.000%> (+0.089%)	⬆️

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