Make login_required work with Fastapi routes

[hmvp]

Should fix #509

Kind of WIP. I could not get hatch to work locally and I am not entirely sure what kind of tests to add without implementing any form of app/route override

[hmvp]

I needed this to use fastapi deps in custom views. The rest can be done with some creative code/monkeypatching

the other stuff needed is basically:

def init_admin(app: FastAPI, session_maker: async_sessionmaker) -> None:
    """Create the sqladmin class."""
    admin = Admin(
        app,
        session_maker=session_maker,
        base_url="/something_long_and_broken_so_we_don't_conflict",
        templates_dir=TEMPLATES_DIR,
    )

    # replace admin starlette app with fastapi so deps work
    admin.admin = FastAPI(
        routes=admin.admin.routes, exception_handlers=admin.admin.exception_handlers, debug=admin.admin.debug
    )

    # replace add_route with fastapi version
    def add_route(  # noqa: PLR0913
        self: FastAPI,
        path: str,
        route: typing.Callable[[Request], typing.Awaitable[Response] | Response],
        methods: list[str] | None = None,
        name: str | None = None,
        include_in_schema: bool = True,  # noqa: FBT001, FBT002
    ) -> None:
        self.add_api_route(path, endpoint=route, methods=methods, name=name, include_in_schema=include_in_schema)

    admin.admin.add_route = types.MethodType(add_route, admin.admin)

    # Mount admin on correct path
    app.mount("/admin", app=admin.admin, name="admin")

    admin.add_view(...)