Document call_with_supported_arguments as a supported public API

[simonw]

Documenting these because I want to use the sync one in https://github.com/datasette/datasette-files

Mark both call_with_supported_arguments and async_call_with_supported_arguments
with the @documented decorator and add documentation to docs/internals.rst
so plugin authors can use these dependency injection utilities in their own code.

https://claude.ai/code/session_01DKogZpHwzCTrbeG4XjXmNc

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📚 Documentation preview 📚: https://datasette--2678.org.readthedocs.build/en/2678/

[simonw]

New docs start here: https://datasette--2678.org.readthedocs.build/en/2678/internals.html#call-with-supported-arguments-fn-kwargs

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.61%. Comparing base (4fcf474) to head (75dca10).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2678      +/-   ##
==========================================
+ Coverage   90.57%   90.61%   +0.03%     
==========================================
  Files          55       55              
  Lines        8450     8452       +2     
==========================================
+ Hits         7654     7659       +5     
+ Misses        796      793       -3     

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