Validation of pydantic models in query params

[mylius]

If a pydantic model is supplied as params and auto cast via fastapi.Depends() the models config is ignored:

Take a look at this example:

app = FastAPI()

class NoExtraFields(BaseModel):
    model_config = ConfigDict(extra="forbid")
    a: int
    b: int

@app.get("/")
def foo(foo: NoExtraFields = Depends()):
    return foo

client = TestClient(app)

response = client.get("/", params={"a": 1, "b": 2, "c": 3})
assert response.status_code == 200, response.text

This assert will pass, since the config is ignored. This is a result of all the params field getting validated separately in solve_dependencies instead of together as is done with body_params.

While there are workarounds as discussed here, this is not a satisfactory state considering the otherwise great compatibility with pydantic.

This PR addresses this by doing a validation for the model as a whole for query params as well.