Create interface for running protocol files

[mcous]

Overview

As part of the overall Protocol Engine project, we need a system component with the job of interpreting our various types of protocol files in order to hand execution responsibility off to other components properly.

Acceptance criteria

• Create an abstract ProtocolFileRunner with two concrete implementations
  • PythonFileRunner
  • JsonFileRunner
  • (exact names not important, can improvise)
• Create a factory that accepts some sort of protocol file value object and returns one of the two instances according to file type
  • Requirement removed due to lack of endpoint wireup at this time
• Methods of the interface can be left out of scope, but speculative ones along the lines of load, play, pause, stop are probably ok