Fix MicroPython optional module compatibility

[pgularski]

Summary

• Reuse the core deque compatibility shim in optional queued, async, and serialization modules
• Replace inspect.isawaitable with a local awaitable check that works without inspect and handles MicroPython coroutine shapes
• Add tests covering optional module imports and awaitable detection

Testing

• Unit tests added for queued, async, and serialization module compatibility
• Unit tests added for native coroutine, generator-based coroutine, and MicroPython-style awaitable detection