Room 2.7.0-beta01

Fix an issue with RoomDatabase.inTransaction() opening a closed database when it shouldn't and should quickly return false if the database is closed (b/325432967). Fix a crash (IllegalArgumentException: not a valid name) in Room's compiler when processing DAO functions with Kotlin inline / value classes (b/388299754). Include Proguard rules in the JVM artifact of room-runtime so that the default constructor of the generated database implementation is not removed since it is used by Room's default initialization that uses reflection (b/392657750).