add initializeFirestore to firestore js externals

Author: nbransby

firebase-firestore/src/jsMain/kotlin/dev/gitlive/firebase/firestore/externals/firestore.kt

@@ -73,6 +73,8 @@ external fun getDocs(query: Query): Promise<QuerySnapshot>
 
 external fun getFirestore(app: FirebaseApp? = definedExternally): Firestore
 
+external fun initializeFirestore(app: FirebaseApp? = definedExternally, settings: dynamic = definedExternally, databaseId: String? = definedExternally): Firestore
+
 external fun increment(n: Int): FieldValue
 
 external fun initializeFirestore(app: FirebaseApp, settings: Any): Firestore
@@ -287,3 +289,10 @@ external class Timestamp(seconds: Double, nanoseconds: Double) {
 
     fun isEqual(other: Timestamp): Boolean
 }
+
+external interface FirestoreLocalCache {
+    val kind: String
+}
+
+external fun memoryLocalCache(): FirestoreLocalCache
+external fun persistentLocalCache(settings: dynamic = definedExternally): FirestoreLocalCache