[Internal] CTL: Adds query scenario

[ealsur]

This PR adds a new scenario for query where we:

1. Insert X amount of documents
2. Start 3 queries:
   1. select * from c - cross partition get all documents
   2. select count(1) from c - cross partition aggregation
   3. select * from c order by c.id - cross partition order by
3. For each type of query we:
   1. Iterate on the query using continuation tokens
   2. Drain the query completely
4. Verify all inserted documents were read in all conditions.

In case there was an error or the query did not get all the inserted documents, we produce the error log including all continuations involved for debugging purposes.

Extra changes for quality

The PR also polishes the code by removing duplicated code across scenarios and putting it inside the shared Utils file.

For ChangeFeedProcessor scenario we also add validation that the number of documents received matches the documents inserted.

For ChangeFeedPull scenario, changing the metric to a gauge instead of a counter yields clearer results, because it shows the total number of read documents instead of an ever increasing counter.