Improve API key management

- Add label to keys
- Add edit page
Use Sentry timesince
Correct public DSN
Relabel 'every event' to better fit with other wordings
Add InMemoryTSDB for tests
Add get_sums helper
Add event frequency condition
Limit rule execution
Unique constraint on (group, rule)
Move public/private options into simple popover
Clean up new note behavior
Rely on can_admin_team filter for permission testing
Rely on can_admin_team filter for permission testing
Dont disable textarea as it prevents submission
Improve activity styles
Remove print statement :/
Added index for group_id_datetime on sentry_event.

When running with a highly populated Postgresql database, the query for previous event takes unacceptably long time to fail if there are no previous instances (9-10 mins for our server). The index not only solves this problem, it speeds up next/previous event queries in general.
Refactor rule notification intelligence
Correct test configuration action
Remove legacy tag notification rules