Non-typing usage of annotations deprecated

[everilae]

PEP-563 decrees that

With this in mind, uses for annotations incompatible with the aforementioned PEPs should be considered deprecated.

In other words non-typing usage of annotations is deprecated and this project has to adapt. The parameter annotations Query, Path, Body, and Header have to be replaced with some other mechanism. Possible solutions:

• Arguments with a corresponding placeholder in the given path are path formatting parameters by default
• Arguments of @get decorated methods are considered query parameters by default
• Arguments of @post, @put, and @patch decorated methods form the body of the request by default – how exactly remains an open question.
  • Perhaps for POST, PUT and PATCH the first positional argument could be considered the body.
  • If content type is application/x-www-form-urlencoded, then arguments form the body.
• Header has to be replaced with a decorator solution of some kind.