chore(ingest): use builtin tuple, drop typing.Tuple, add docstring

[oab24413gmai]

Small modernization in chromadb/ingest/impl/utils.py:

• Drop the unused from typing import Tuple and use the builtin tuple[...] in the parse_topic_name return annotation (project already targets a Python version where this is supported).
• Add a one-line docstring to create_topic_name for parity with its sibling.

No behavior change.

[github-actions]

Reviewer Checklist

Please leverage this checklist to ensure your code review is thorough before approving

Testing, Bugs, Errors, Logs, Documentation

• Can you think of any use case in which the code does not behave as intended? Have they been tested?
• Can you think of any inputs or external events that could break the code? Is user input validated and safe? Have they been tested?
• If appropriate, are there adequate property based tests?
• If appropriate, are there adequate unit tests?
• Should any logging, debugging, tracing information be added or removed?
• Are error messages user-friendly?
• Have all documentation changes needed been made?
• Have all non-obvious changes been commented?

System Compatibility

• Are there any potential impacts on other parts of the system or backward compatibility?
• Does this change intersect with any items on our roadmap, and if so, is there a plan for fitting them together?

Quality

• Is this code of a unexpectedly high quality (Readability, Modularity, Intuitiveness)