Changes to CLI

[duckduckdroid]

Small changes to help the developer out when their app is not starting

1. if the cli detects that a function has been passed instead of a Sanic instance it will error out and suggest that the dev uses --factory eg. sanic fake.factory.run

2. if the cli detects a path has been passed instead of a Sanic instance it will error out and suggest the that the dev uses --simple eg. sanic ./fake/

I welcome all changes and teachings! :)

[codecov]

Codecov Report

Merging #2401 (45c1d62) into main (0c9df02) will increase coverage by 0.115%.
The diff coverage is 100.000%.

@@              Coverage Diff              @@
##              main     #2401       +/-   ##
=============================================
+ Coverage   87.110%   87.225%   +0.115%     
=============================================
  Files           60        60               
  Lines         5004      5010        +6     
  Branches       905       904        -1     
=============================================
+ Hits          4359      4370       +11     
+ Misses         472       468        -4     
+ Partials       173       172        -1     

Impacted Files	Coverage Δ
sanic/mixins/listeners.py	100.000% <100.000%> (ø)
sanic/mixins/runner.py	95.744% <100.000%> (+0.851%)	⬆️
sanic/server/protocols/http_protocol.py	88.095% <0.000%> (+3.571%)	⬆️

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