Ruff handles black, flake8 and isort in one package, and is way faster.
The isort rules had not been enforced, so this commit includes a lot
of import resorting changes.
I switched to flake8-bugbear and the standard black-compatible line
length of 80 + 10% (so max 88 characters), so some line reflowing is
included too.
Finally, because bugbear rightly points out that `setattr()` is less
performant, I've switched the `__signature__` assigment back to using
a direct assignment with type ignore comment.
The header name is configurable, and defaults to `X-FastAPI-Cache`,
the value is either `HIT` or `MISS`.
Note that the header is not set at all when the cache is disabled.
Instead of assuming that the Request and Response injected keyword
arguments can be named `request` and `response`, use namespaced
keyword names starting with a double underscore.
By default the parameter names now start with `__fastapi_cache_` and so
are a) clearly marked as internal, and b) highly unlikely to clash with
existing keyword arguments. The prefix is configurable in the unlikely
event that the names would clash in specific cases.
Use the return annotation to decode cached data to the correct type.
This follows the same logic FastAPI uses to JSON request bodies.
For the PickleCoder, this is a no-op as pickle already stores type
information in the serialised data.
Not all endpoints accept a __signature__ attribute, nor should the
cache decorator modify the decorated endpoint. Attach the signature
to the returned inner function instead.
While here, refactor the signature updating code, and extract it to
a separate function.
