Delay entitysearch request

Instead of triggering an API request on every single keystroke, entityselector now respects the
"delay" option inherited from the base suggester.

Change-Id: Id332ed9a8f78363bcb68fd890ae0d0913a2c7d87
Remove usage of deprecated code in EntitySearchTextGenerator

Change-Id: I343d219f8626e4786e006f3e2fe6bf8d95b4fd68
Merge "Delay entitysearch request"
Merge "Remove usage of deprecated code in EntitySearchTextGenerator"