Expose track name and used/unused activity signals

[Qizot]

Add name(), used(), and unused() to MoqTrackProducer and MoqMediaProducer so FFI consumers can observe subscriber activity. Plumb a single track accessor through moq-mux's import decoder and mirror the new API in the Python moq-lite bindings.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 56279c1c-f401-4904-8aea-71c9166b4889

📥 Commits

Reviewing files that changed from the base of the PR and between 6adf3c3 and b39061e.

📒 Files selected for processing (4)

• py/moq-lite/moq_lite/publish.py
• rs/moq-ffi/src/producer.rs
• rs/moq-ffi/src/test.rs
• rs/moq-mux/src/import/decoder.rs

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Walkthrough

This PR exposes track activity and naming across the MOQ producer stack. The Rust FFI layer introduces an internal MediaProducer wrapper pairing decoders with their underlying track handles, enabling media streams to report names and transitions between used/unused states. Raw tracks gain corresponding name and activity methods. A new wait_for_track_activity helper maps async track state waits into error-safe operations. The decoder layer adds a track() accessor for single-format producers. Python wrappers delegate the new methods to their Rust counterparts. Tests validate that published raw and media tracks correctly transition through their lifecycle states.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Expose track name and used/unused activity signals' accurately summarizes the main change: adding name and activity observation APIs to track producers.
Description check	✅ Passed	The description directly relates to the changeset, clearly explaining the addition of new APIs and the plumbing through moq-mux decoder and Python bindings.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

⚔️ Resolve merge conflicts

• Resolve merge conflict in branch moq-ffi-track-activity

✨ Simplify code

• Create PR with simplified code

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