Room 2.3.0-alpha04

Room now offers a general callback API RoomDatabase.QueryCallback, for when queries are about to execute, which can be useful for logging in debug builds. The callback can be set via RoomDatabase.Builder#setQueryCallback(). ( Iaa513, b/174478034, b/74877608) Room will now default to using an Enum to String and vice versa type converter if none is provided. If a type converter for an enum already exists, Room will prioritize using it over the default one. ( b/73132006) If a one-way type converter for reading already exists for the Enum, Room might accidentally use the built-in String to Enum converter which might not be desired. This is a known issue and can be fixed by making it a two-way converter. See: b/175707691 Fixed an issue where Room would incorrectly disabled incremental annotation processing in newer JDK versions. ( b/171387388) Fixed an issue with Room finding the generated class when multiple class loaders are used. Thanks for the fix 'Serendipity | 892449346@qq.com'! ( b/170141113) Fixed an issue where Room would generate incorrect code when a Kotlin @Dao had a base class whose generics are primitives in the JVM. ( b/160258066) Room will now default to using beginTransactionNonExclusive if WAL mode is enabled and API is 16 or more. Thanks to '