Added millisecond delay to reduce the number of queries.

In order to reduce API queries on search, I've added a 200ms delay
before any typeahead queries are triggered. This will have two
impacts - firstly, there will be far fewer queries sent to the
server, significantly reducing load, and secondly it will reduce
the number of queries in the browser's query pool, making the UI
more responsive.

story: 2000070
Change-Id: I8d3db0ecce1b02f9fc301bab6f298f75d0f55c14
Merge "Added millisecond delay to reduce the number of queries."