Add example assurance test

[jonsnyder]

Description

This adds a call to get a token and start an assurance session for tests that need it. Then you can read the logs and find the one you are interested in.

• This is implemented as a Request Hook. Call createAssuranceRequestHook inside a functional test, then call t.addRequestHooks with the new request hook.
• This will create or use the current assurance session (One session per test run)
• When there is a request to experience edge, the request hook will add the assurance session id header to the request. It also keeps track of that request id and buckets all the assurance events that were logged for that request.
• You can then look for a specific log by calling assuranceRequestHook.find() with a predicate. This will wait up to 5 seconds for a log matching the predicate.
• Then you can run assertions on the event that you found.
• To debug and see all the requests, you can wait 5 seconds for all the events to be recorded, then call fetchMore on the requestHook so that all the events all fetched. Then call debug on one of the requests to log all the events.

Related Issue

Motivation and Context

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (non-breaking change which does not add functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA or I'm an Adobe employee.
• I have made any necessary test changes and all tests pass.
• I have run the Sandbox successfully.