Use Protocols for Type Annotations

[tekktrik]

Using typing protocols might help with some of the issues in #59. They can live in circuitpython_typing.

[DJDevon3]

Merged but never closed? The referenced PR 59 & 66 were resolved too.

[tekktrik]

Technically this is still valid - the idea was to use duck typing, but I don't believe that is implemented (or decided otherwise).