Conditionally inject CLI arguments into factory

[ahopkins]

When starting with --factory, the CLI will attempt to inject the CLI arguments Namespace into the factory (if possible).

Additional benefit is that we will allow arbitrary arguments in the CLI in factory mode.

[codecov]

Codecov Report

Merging #2402 (5726732) into main (c9dbc8e) will decrease coverage by 0.059%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##              main     #2402       +/-   ##
=============================================
- Coverage   87.243%   87.183%   -0.060%     
=============================================
  Files           60        60               
  Lines         5017      5017               
  Branches       904       904               
=============================================
- Hits          4377      4374        -3     
- Misses         468       470        +2     
- Partials       172       173        +1     

Impacted Files	Coverage Δ
sanic/server/protocols/http_protocol.py	84.523% <0.000%> (-3.572%)	⬇️

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[prryplatypus]

LGTM. Wanna add a test?

[ahopkins]

LGTM. Wanna add a test?

I was waiting until #2401 is merged so that the tests could reuse the same fake factory module.