Support better integration testing

[Laremere]

There are is some functionality missing:

• Defining per test MMF and Evaluator
• Pattern around testing multiple threads at once.
• Advancing Time to remove sleep dependence (local only)
• Modifying config to test non-default options (local only)

To support these, I will do some additional refactoring to the e2e testing library, as well as the app binding library. So that it supports start/stop, and to better support new binding parameters.

[Laremere]

• If the mmf returns an error (and only the mmf), the fetch match calls has the error text in its response.
• If the evaluator returns an error (and only the evaluator), the fetch match calls has the error text in its response.