creates gwtc catalog/superevent/gevent database tables and foreignkeys. assigns permissions to catalog_managers group, and sets up the creation API backend. 

TODO: work on querying and catalog event views. 

- New pipelines
- New FRD search
- Add upload permissions for brandon.oneal and ryan.fisher

by default the public alert page is cached 300s, but that can be changed
with an environment variable when deployed

This reverts commit ef1026e4.

context: users can search a gpstime range for events and superevents
by searching by the observation/engineering period, which are hardcoded
in. the public page was changed last week to separate candidates by
observation period, as well as providing a direct anchor link to each
section. ER15 wasn't included at first (just O4/O3) because what are the
changes of a significant public candidate in the next week, right? well
here we are.