Light RTC_IO refactor

[Dominaezzz]

Thank you for your contribution!

We appreciate the time and effort you've put into this pull request.
To help us review it efficiently, please ensure you've gone through the following checklist:

Submission Checklist 📝

• I have updated existing examples or added new ones (if applicable).
• I have used cargo xtask fmt-packages command to ensure that all changed code is formatted correctly.
• My changes were added to the CHANGELOG.md in the proper section.
• I have added necessary changes to user code to the Migration Guide.
• My changes are in accordance to the esp-rs developer guidelines

Extra:

• I have read the CONTRIBUTING.md guide and followed its instructions.

Pull Request Details 📖

Description

cc @bugadani, let's design here.

I'm still trying to figure out the macro lol.

Testing

👀

[bugadani]

We should probably start by defining the InputSignal/OutputSignal equivalent. On the S3 there is no RTC_IO matrix, just alternate functions, so there are no numbered signals just yet, but on P4 there will be (9.13 LP Peirpheral Signal List).

This is mostly just generating two enums from metadata, and the GPIO matrix code could be a good enough template.

[github-actions]

New commits in main has made this PR unmergable. Please resolve the conflicts.