chore: improve type hints

[waketzheng]

Summary

Only improve type hints, does not change any logic

1. typing.xxx --> from typing import xxx
2. Run ruff check --fix starlette tests
3. from typing import ContextManager --> from contextlib import AbstractContextManager

Checklist

• I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.

[Kludex]

Can we enforce those via ruff?

[Kludex]

If you can find ruff rules to enforce this behavior, I'm happy to accept it.

[waketzheng]

Run ruff check --select=UP --fix . can change from typing import Sequence to from collections.abc import Sequence, but it does not change the typing.Sequence. So I changed all typing.xxx to be from typing import xxx.

A mini demo to verify:

# bb.py
import typing
from typing import Callable, ContextManager, Sequence


def foo(a: Callable, b: ContextManager, c: Sequence) -> tuple[typing.Sequence, typing.ContextManager]:
    pass

Run ruff check bb.py will get the following output:

bb.py:2:1: UP035 [*] Import from `collections.abc` instead: `Sequence`
  |
1 | import typing
2 | from typing import Callable, ContextManager, Sequence
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ UP035
  |
  = help: Import from `collections.abc`

bb.py:2:1: UP035 `typing.ContextManager` is deprecated, use `contextlib.AbstractContextManager` instead
  |
1 | import typing
2 | from typing import Callable, ContextManager, Sequence
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ UP035
  |

Found 2 errors.
[*] 1 fixable with the `--fix` option.

Then run ruff check --fix bb.py, the file was updated to be:

import typing
from collections.abc import Sequence
from typing import Callable, ContextManager


def foo(a: Callable, b: ContextManager, c: Sequence) -> tuple[typing.Sequence, typing.ContextManager]:
    pass

[waketzheng]

Can we enforce those via ruff?

Yes, ruff --select=UP . do that.

[Kludex]

Can we enforce those via ruff?

Yes, ruff --select=UP . do that.

But you replaced everything in this PR manually... Right? The diff duplicated since last time I checked.

[waketzheng]

Awaitable, Generator, Sequence, ... was auto moved to collections.abc by ruff check --fix .

While from typing import AsyncContextManager, ContextManager received complaint from ruff check and was replaced to from contextlib import AbstractAsyncContextManager, AbstractContextManager manually.

[waketzheng]

I pushed two commits since you assigned it to me.