Better typing (response class and issue with .get, .post, ...)

[novitae]

This PR includes two things:

• In my previous PR to make the methods .get, .post, .put, ..., I forgot to add total=False in the TypedDict they were unpacking, which was getting the type hint to say Any.

  • Before:
    
  • After:
    

• A type hint for the response class. The results of requests were always an object Response, even if the response_class was changed. Now, if the response_class argument is set, the result hint will be an instance of this argument. Here is what it does:
  

[lexiforest]

Let's make the typing_extensions an optional dependency.

[novitae]

The TypeVar from typing only supports the default argument since python 3.12. Without this argument, the response class hint is broken, that's why I was importing it via typing_extension. I changed that.