typing: Fix signature of Redis.transaction

[stephenfin]

Description of change

The return type depends on the value of the value_from_callable kwarg. Indicate this with type hinting.

Pull Request check-list

• Do tests and lints pass with this change?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?

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Note

Low Risk
Type-only API signature changes to Redis.transaction; runtime behavior is effectively unchanged aside from accepting explicit keyword parameters instead of popping them from **kwargs. Low risk unless callers relied on passing these options only via **kwargs in unusual ways.

Overview
Improves type hints for Redis.transaction so its return type is conditional on value_from_callable (returns List[Any] when false, otherwise returns the callable’s generic T) via @overload + TypeVar.

Updates the runtime signature to expose shard_hint, value_from_callable, and watch_delay as explicit keyword parameters (instead of pulling them out of **kwargs), tightening typing around watches and keyword arguments.

^{Written by Cursor Bugbot for commit 03d11c4. This will update automatically on new commits. Configure here.}

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[petyaslavova]

Hi @stephenfin , thank you for your contribution! We will have a look at it.