feat: add better macro ergonomics + run once

[SeaRoll]

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[Copilot]

Pull request overview

This PR enhances the ATO async runtime with improved macro ergonomics and a new run_once method for more flexible task execution. The changes introduce a TaskHandle wrapper type and redesign the task! macro to provide a more intuitive API.

Key changes:

• Introduced TaskHandle<'a> struct to wrap pinned futures, simplifying the spawning API
• Redesigned task! macro with named binding syntax for better ergonomics
• Added run_once() method to Spawner for executing single tasks on demand

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/lib.rs	Core library changes: added TaskHandle struct, updated spawn() to accept TaskHandle, redesigned task! macro with new syntax, and implemented run_once() method
examples/yield.rs	Updated to use new task! macro syntax with named bindings
examples/until_condition.rs	New example demonstrating run_once() usage in a loop-based execution pattern
examples/time.rs	Updated to use new task! macro syntax
examples/simple.rs	Updated to use new task! macro syntax and simplified task message
README.md	Updated documentation to reflect new API usage and version bump to 2.0.1
Cargo.toml	Version bump from 2.0.0 to 2.0.1

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