feat: support json.RawMessage

[danielgtaylor]

This adds support for json.RawMessage which generates an empty schema (no validation). This means any input is valid and it's up to the handler code to determine if there are any errors.

Fixes #348.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.28%. Comparing base (73362ec) to head (bb72a27).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #350      +/-   ##
==========================================
+ Coverage   95.25%   95.28%   +0.02%     
==========================================
  Files          19       19              
  Lines        2846     2840       -6     
==========================================
- Hits         2711     2706       -5     
+ Misses         98       97       -1     
  Partials       37       37              

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[sven4all]

Looks good to me, this is the behaviour I would expect.

Is it an idea to add it to the documentation as well?

I am not sure where to include it but it could be here https://github.com/danielgtaylor/huma/blob/main/docs/docs/features/request-validation.md or here https://github.com/danielgtaylor/huma/blob/main/docs/docs/how-to/custom-validation.md.