feat(hid-rp): update gamepad to use `unit::degree()` for hat switch

[finger563]

Description

• Update hid-rp-gamepad to use unit::degree() instead of hard-coded constant for better readability

Motivation and Context

Makes the code easier to understand and provides a better example for using hid-rp library rather than hard-coding the 0x0014 constant (0th nibble = system, 4 = english rotation; 1st nibble = length exponent, 1 = degrees).

How has this been tested?

Building and running the hid_service/example on a QtPy ESP32s3 and testing with iOS and Android.

Screenshots (if appropriate, e.g. schematic, board, console logs, lab pictures):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation Update
• [ ] Hardware (schematic, board, system design) change
• [x] Software change

Checklist:

• [ ] My change requires a change to the documentation.
• [ ] I have added / updated the documentation related to this change via either README or WIKI

Software

• [ ] I have added tests to cover my changes.
• [ ] I have updated the .github/workflows/build.yml file to add my new test to the automated cloud build github action.
• [x] All new and existing tests passed.
• [x] My code follows the code style of this project.

[github-actions[bot]]

:white_check_mark:Static analysis result - no issues found! :white_check_mark: