As a LU I can filter events by date and users by registration date

Problem
LU should filter events within specific date ranges of event: before / after / between.
LU should filter users by registration date on the search users page

Solution
Created a new plugin for Search API that shows before / after between, we can reuse this for other date based filters in the future. And added these for the above problems.

https://github.com/goalgorilla/open_social/pull/1458