feat(cpp): add functions related to consumer groups and topics

[slbotbm]

Which issue does this PR address?

Closes #
Relates to #2100

Rationale

Adds the following functions:

• get_consumer_groups
• get_topics
• update_topic
• delete_topic

What changed?

• Added code and test for the above 4 mentioned functions.
• also aligned create_stream and create_topic to return StreamDetails and TopicDetails respectively as was the behaviour of the rust sdk.

Local Execution

• Passed
• Pre-commit hooks ran

AI Usage

If AI tools were used, please answer:

1. Which tools? codex
2. Scope of usage? code generation
3. How did you verify the generated code works correctly? read through and reasoned about it.
4. Can you explain every line of the code if asked? Yes

[github-actions]

Thanks for the PR. It is labeled S-waiting-on-review and queued for review.

Slash commands (own line, regular comment) move it around the queue:

• /ready - back to S-waiting-on-review after addressing feedback
• /author - flip to S-waiting-on-author while you finish changes
• /request-review @user-or-team - request a reviewer

See CONTRIBUTING.md for details.