* add bundle registry service to avoid dependency cycles
* move user support bundle collector to user service
* move usage stat bundle implementation to usage stats
* add info for background service
* fix remaining imports
* whitespace
* chore: remove unused test helper from sqlstore
TimeNow() is no longer used in any tests in this package.
* chore: move sqlstore.SQLBuilder to the infra/db package
This required some minor refactoring; we need to be a little more explicit about passing around the dialect and engine. On the other hand, that's a few fewer uses of the `dialect` global constant!
* chore: move UserDeletions into the only package using it
* cleanup around moving sqlbuilder
* remove dialect and sqlog global vars
* rename userDeletions to serviceAccountDeletions
* move original stats service into a separate package
* add stats service to wire
* move GetAdminStats
* switch to using stats.Service
* add missing package
* fix api tests
