sketch use of Annotated types

[vincentsarago]

Possible fix for using Optional Path parameter when multiple routes are defined

ref https://github.com/tiangolo/fastapi/discussions/9278

[vincentsarago]

While the tests pass, I don't think the solution is 👍

Removing the use of Query/Path and use simple Annotated type means that we are loosing OpenAPI description/title.

I've opened https://github.com/tiangolo/fastapi/pull/9670 to see if we can do something about it

[vincentsarago]

I'm going to move forward with this PR because:

• using Annotated seems to be the new default way of doing things in pydantic/fastapi
• We don't want to be blocked at fastapi 0.95
• We want to be able to use fastapi>0.100 with pydantic 2.0