moq-lite: Remove Produce struct and simplify API

[kixelated]

The Produce<P, C> struct was a named tuple for bundling producer/consumer pairs. This removes it and changes the API pattern:

• X::produce() now returns just the producer (e.g., BroadcastProducer)
• Call .consume() on the producer to get a consumer when needed

This simplifies the API and makes ownership clearer.

[coderabbitai]

Walkthrough

This pull request refactors the producer-consumer API design across the moq-lite codebase. The main change removes the Produce<P, C> wrapper type that previously bundled producer and consumer fields together. Instead, produce() methods now return a producer directly, with a new consume() method on producers providing access to the corresponding consumer. Direct methods are added to Origin and Broadcast types (e.g., publish_broadcast(), create_track()) that were previously accessed through nested .producer fields. All call sites throughout the codebase are updated to use the new API patterns, including client code, importers, and relay implementations.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 78.18% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The PR title accurately describes the main change: removing the Produce struct and simplifying the API pattern from returning producer/consumer pairs to returning only producers.
Description check	✅ Passed	The PR description clearly explains the changes: removal of Produce struct, API pattern shift to returning only producers, and introduction of .consume() method on producers.

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✨ Finishing touches

• 📝 Generate docstrings

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