Add toObjects/dataObjects (from Firestore KTX) to Firestore

[EdricChan03]

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Library	Class	Member	Platforms
firestore	Query	toObjects	Android
firestore	Query	dataObjects	Android
firestore	DocumentReference	dataObjects	Android

I suspect these methods would be handy aliases to the following code:

inline fun <reified T> Query.toObjects() = get().documents.map { it.data<T>() }

// TODO: Implement includeMetadataChanges behaviour
inline fun <reified T> Query.dataObjects(includeMetadataChanges: Boolean) = snapshots.map {
    snapshot -> snapshot.documents.map { it.data<T>() }
}
inline fun <reified T> DocumentReference.dataObjects(includeMetadataChanges: Boolean) = snapshots.map {
    snapshot -> snapshot.data<T>()
}

• Implementation from Firestore KTX