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 :white_check_mark:

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

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Additional details and impacted files

```diff @@ 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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