Add dactyl_manuform_pi_pico

[GustawXYZ]

Adds new keyboard under handwired/dactyl_manuform_pi_pico

It is a mashup of alcor_datyl nad dactyl_manuform(5x6): a dactyl_manuform running on Pi Pico micro controller

Originally opened as #21538 but I accidentally broke that repo when trying to re-base, thus a new one.

Description

Started by cloning alcor_dactyl. Changed GPIOs to be Raspberry Pi Pico friendly. Changed the layout to use dactyl_manuform 5x6. Added my default keymap.

Types of Changes

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

Issues Fixed or Closed by This PR

Checklist

• [X] My code follows the code style of this project: C, Python
• [X] 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.
• [X] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [X] I have tested the changes by flashing the keyboard and verified that they work and don't break anything (as well as I can manage).