Introduce common part interfaces

The goal here is to define a set of common interfaces parts can implement. This would help us with being able to use parts for different purposes.

An example could be that we define a common `IServo` interface that specifies what data a servo sensor can give out (i.e. current angle) and what inputs it expects (commanded angle). That way we could then use different implementations of a servo without having to change the code that is using them