Types for return type

[danielpassy]

Is your feature request related to a problem? Please describe.
Proper typing on return type of methods

from uplink import Consumer, post

class Client(Consumer):
    @post("example")
    def example_method(self) -> list[int]:
        pass

a = Client().example_method

you can verify the return type with mypy with one single command:

uv run --python 3.12 --with 'uplink[aiohttp]>=0.10.0' --with mypy mypy --python-version 3.12 --ignore-missing-imports --disable-error-code empty-body -c $'from uplink import Consumer, post\n\nclass Client(Consumer):\n    @post("example")\n    def example_method(self) -> list[int]: ...\n\na = Client().example_method\nreveal_type(a)'

yes, this iwas generated by AI, but that just run python 3.12 with uplink[aiohttp]>=0.10.0' and mypy (latest) and verify the return of the var a on the previous code snippet

<string>:8: note: Revealed type is "Any"
Success: no issues found in 1 source file

it's Any, not list[int] as expected.

Describe the solution you'd like
I honestly don't know. This is open to discussion

This lib is kind of abandoned, so I'm not sure if a refactor is worth it.
OtOH, I asked AI to one shot type stubs and it came up with this
https://github.com/danielpassy/uplink-stubs

Additional context
Add any other context or screenshots about the feature request here.