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
Low risk: changes are limited to type annotations and overloads for Redis.transaction() with no functional behavior changes.

Overview
Updates Redis.transaction() typing to correctly model its conditional return type.

Adds a generic TypeVar plus two @overload signatures so type checkers infer List[Any] when value_from_callable=False and infer the callable’s return type T when value_from_callable=True; also makes the keyword parameters (shard_hint, watch_delay, value_from_callable) explicit in the signature.

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[petyaslavova]

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