Support limit for archive policies

[jmfee-usgs]

Policies currently query the index for matching products/events to be archived.
If policy is broad, query may take a while and block ongoing indexing.

[Capprin]

Archive policies are sections of configuration, and are run by the indexer. Because archive queries are sometimes large (and block processing of other products), running with a limit will break up the job and open the opportunity to process other products. Take advantage of the limit parameter added to the ProductIndexQuery.

[Capprin]

Double check that the limit works for event and product tables. (There exists ArchivePolicy for events and ProductArchivePolicy for products).