feat: add basic channel implementation

[SeaRoll]

No description provided.

[Copilot]

Pull request overview

This PR introduces a basic multi-producer, multi-consumer (MPMC) channel implementation for the async runtime, built on top of the heapless crate's MPMC queue. The implementation provides async send/recv operations along with synchronous try_send/try_recv alternatives.

Key changes:

• Adds a new channels module with Producer and Consumer types supporting both blocking and non-blocking operations
• Introduces channel! macro for convenient channel creation and spawn_task! macro for task spawning
• Updates examples to use fully-qualified paths (e.g., ato::Spawner instead of importing Spawner)

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/lib.rs	Exposes the new channels module and adds the spawn_task! macro for spawning tasks with a spawner
src/channels.rs	Implements the channel infrastructure with Producer/Consumer types, async futures, and the channel! macro
examples/yield.rs	Updates imports to use fully-qualified paths for Spawner and yield_now
examples/until_condition.rs	Updates imports to use fully-qualified path for Spawner
examples/time.rs	Updates imports to use fully-qualified paths for Spawner and sleep
examples/simple.rs	Updates imports to use fully-qualified path for Spawner
examples/channels.rs	Adds new example demonstrating channel usage with producer/consumer tasks

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