frontend/input_interpreter: Add InputInterpreter API

The InputInterpreter class interfaces with HID to retrieve button press states. Input is intended to be polled every 50ms so that a button is considered to be held down after 400ms has elapsed since the initial button press and subsequent repeated presses occur every 50ms.

Co-authored-by: Chloe <25727384+ogniK5377@users.noreply.github.com>