Add Watchdog trait

[williampMSFT]

This adds a trait to feed a watchdog timer

[Copilot]

Pull request overview

This PR adds a new Watchdog trait to the embedded-mcu-hal crate, providing an abstraction for feeding a processor's watchdog timer to prevent resets. It includes a blanket implementation for &mut T references.

Changes:

• Added a new Watchdog trait with an associated Error type and a feed method
• Added a blanket impl of Watchdog for &mut T where T: Watchdog
• Registered the new watchdog module as a public module in lib.rs

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
embedded-mcu-hal/src/watchdog.rs	New file defining the Watchdog trait with a feed method and a blanket impl for &mut T
embedded-mcu-hal/src/lib.rs	Adds pub mod watchdog; to expose the new module

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[jerrysxie]

@felipebalbi @williampMSFT Are we aligned on implementing this for MCXA and IMXRT?

[williampMSFT]

@felipebalbi @williampMSFT Are we aligned on implementing this for MCXA and IMXRT?

I think so, yeah. There are a couple catches, though - we need to publish this crate to crates.io with semver versions, and we need to hide the implementation and linkage to embedded-mcu on the MCXA HAL behind a feature flag

[jerrysxie]

@gjpmsft @JamesHuard @bramsdell-ms @jamesmunns @diondokter Any feedback on this initial implementation of a MCU agnostic watchdog trait?