test: Complete all matching operations

Adds special operations support i.e. $$unsetOrMatches for testing
nested schema equality of results and events. Adds Recursive
equality test that tracks the path into the object it is testing
for ease of error tracing. Enable Change Stream tests with the
repurposed EventsCollector class to iterate change events. Adds
find, insertMany, iterateUntilDocumentOrError, and failPoint operations.

NODE-2287

Author: nbbeeken