Add Feature: Retro Tapping Timeout

[JohnRigoni]

Description

Add a timeout to retro tapping.

With RETRO_TAPPING_TIMEOUT enabled, holding a dual function key for longer than the specified timeout duration will result in no keycode being sent when the key is released.

This setting can be enabled in your config.h and takes an integer that is the timeout duration in milliseconds.

Before RETRO_TAPPING_TIMEOUT

After RETRO_TAPPING_TIMEOUT 😴

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout (addition or update)
• Documentation

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[JohnRigoni]

This feature is following the retro tapping bug fix #23641. Hopefully these two changes revitalize the retro tapping workflow.

[drashna]

Would a per key option make sense here?