Room 2.7.0-alpha04

Fixed an issue in Room's annotation processor would generate incompatible KMP code when a multi-map return type was defined in a DAO. ( b/340983093) Fixed an issue where Room would fail to find the generated database implementation if the @Database annotated class had no package. ( b/342097292) Fixed an issue where enabling auto-close and multi-instance invalidation would sometimes cause a ConcurrentModificationException when the database was auto-closed due to being idle.