* Produce kafka events when keys are added
* Consume key changes in syncapi with TODO markers for handling them and catching up
* unbreak tests
* Linting
* Add storage layer for postgres/sqlite
* Return OTK counts when inserting new keys
* Hook up the key DB and make a test pass
* Convert postgres queries to be sqlite queries
* Blacklist test due to requiring rejected events
* Unbreak tests
* Update blacklist
* Add a new component: currentstateserver
- Add a skeleton for it, with databases and a single query method.
- Add integration tests for it.
- Add listen/address fields in the config (breaking as this will force people to specify this to validate)
Not currently hooked up to anything yet.
* Unbreak config tests
* Add current_state to sample config
* comments
* Make userapi responsible for checking access tokens
There's still plenty of dependencies on account/device DBs, but this
is a start. This is a breaking change as it adds a required config
value `listen.user_api`.
* Cleanup
* Review comments and test fix
