ETM improvements

[bugadani]

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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 API guidelines

Extra:

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

Pull Request Details 📖

Description

• ETM types are no longer prefixed
• GPIO ETM types are no longer generic
• GPIO ETM now works with signals in addition of pins, allowing better flexibility.

[bjoernQ]

LGTM

[MabezDev]

LGTM, thanks!