Allow for custom name generation

[ahopkins]

Replaces #2928

While I appreciate the work that @hamedsh did in the previous PR, I think this more closely aligns with Sanic in allowing the name generation to be overriden and not specifying exactly how. It leads to a simpler API.

[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.651%. Comparing base (33bc520) to head (aa49ec9).
Report is 4 commits behind head on main.

❗ Current head aa49ec9 differs from pull request most recent head c549866

Please upload reports for the commit c549866 to get more accurate results.

Files	Patch %	Lines
sanic/mixins/base.py	90.909%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #2961       +/-   ##
=============================================
+ Coverage   87.640%   87.651%   +0.011%     
=============================================
  Files          101       101               
  Lines         7573      7572        -1     
  Branches      1329      1328        -1     
=============================================
  Hits          6637      6637               
+ Misses         641       639        -2     
- Partials       295       296        +1     

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