Support Annotated types in OpenAPIHandler

[tyzhnenko]

The idea is to support Annotated in building OpenAPI documentation and making type checkers happy as well.

I don't think this implementation is the right way to support such a feature. So, feel free to share any thoughts you have.

Example:

class Cats(APIController):
    @get("/cats/{cat_id}")
    def get_cat_details_annotated(cat_id: int) -> Annotated[Response, CatDetails]:
        ...
        return self.json(
            data=asdict(
                CatDetails(**cat_details)
            )
        )

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bec8e14) 96.37% compared to head (f769e15) 96.40%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #472      +/-   ##
==========================================
+ Coverage   96.37%   96.40%   +0.02%     
==========================================
  Files          69       69              
  Lines        6487     6501      +14     
==========================================
+ Hits         6252     6267      +15     
+ Misses        235      234       -1     

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