Initialize Firebase in direct boot mode

Note that even though `FirebaseApp itself initializes, none of the other SDKs get initialized until the user unlocks the devices.

Author: vkryachko

firebase-common/src/main/AndroidManifest.xml

@@ -23,6 +23,7 @@
         <provider
             android:name="com.google.firebase.provider.FirebaseInitProvider"
             android:authorities="${applicationId}.firebaseinitprovider"
+            android:directBootAware="true"
             android:exported="false"
             android:initOrder="100" />
         <service