feat: add get_members method to Room

[AchieverSana]

Adds a get_members method to the Room class that fetches the list of currently joined user IDs by querying the Matrix server directly via AsyncClient.joined_members.

Closes #70

[PenguinBoi12]

Nice, clean addition, docstring and tests are solid, and the wrapper matches the existing patterns. Well done. Apart from the docstring format, it's a great PR.

[AchieverSana]

Fixed the docstring indentation to match the rest of the codebase's style. Thanks for the catch!

[PenguinBoi12]

Fixed the docstring indentation to match the rest of the codebase's style. Thanks for the catch!

Hi, the docstring still seems incorrectly formatted. Make sure your editor isn't applying a formatting on it before you push. @AchieverSana

[AchieverSana]

Ah, turns out it wasn't just the docstring — the whole method was mis-indented. Fixed and double-checked with black this time. Pushed in b5c95f0; thanks for catching it!

[PenguinBoi12]

LGTM 🦭

[AchieverSana]

Hey, this should be ready to merge now — just needs the workflow approvals if you get a chance!