Adds db install / uninstall

#fixes #50 

Adds `message_broker_producer` database table.

**To test**
- Disable -> uninstall / re-install module.
- Check for `message_broker_producer` table in database.
- Disable -> uninstall again to confirm database is removed.

**Note**: Your installation will have to be rebuilt after testing as all of the message_broker_producer variable settings will be removed in the uninstall step.