Add GraphQL API for fetching arbitrary event log aggregations

Created by: dadlerj

Request:

any possibility to expose time-based code intel metrics? currently the API only has it on the user, and it's just an aggregate count

Plus additional context:

right, so one thing we could do is poll it daily and store that data to get a sense of actions/day

however if our daily job fails then we lose data for that day. it would be nice if we could get daily metrics directly instead.

We should provide a general way for admins to request daily/weekly/monthly event log aggregates with filters (e.g. for different event names).