Added support for the Shisaku keyboard.

[ADPenrose]

Description

Added support for the Shisaku keyboard; a 40% alice-like keyboard, assembled only with THT components, featuring a solenoid that brings back that cozy typewriter feel.

Types of Changes

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

Issues Fixed or Closed by This PR

• As this is the first PR regarding the kintsugi keyboard, no issue has been fixed or closed yet.

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 and verified that they work and don't break anything (as well as I can manage).

[ADPenrose]

Were the added changes sufficient and correct?

[ADPenrose]

Compiled and flashed on different hardware and everything works just as expected.

[ADPenrose]

Were the added changes correct?

[ADPenrose]

Were the added changes right?

[ADPenrose]

Do I need to modify something else so that this keyboard is merged?

[ADPenrose]

Is everything correct?

[drashna]

Thanks!