Include operation times in almost all requests

[danthegoodman1]

Requests such as addindex, addmultiple, etc. should have timings that are returned in the API response. See example with how search is timed, and how serializing and loading indexes are timed.

For requests that just respond with a string (update and delete) they can be given a JSON response similar to add that can include the current message, the docID in its own kv pair, and the timing.

Update should have 2 timings: one for the delete and one for the insert

Addmultiple should have a single timing that is the sum of all the individual add times