feat(firestore): support clearPersistence() & terminate() APIs

packages/firestore/android/src/main/java/io/invertase/firebase/firestore/UniversalFirebaseFirestoreModule.java

@@ -83,4 +83,8 @@ Task<Void> settings(String appName, Map<String, Object> settings) {
       return null;
     });
   }
+
+  Task<Void> clearPersistence(String appName){
+    return getFirestoreForApp(appName).clearPersistence();
+  }
 }

packages/firestore/android/src/reactnative/java/io/invertase/firebase/firestore/ReactNativeFirebaseFirestoreModule.java

@@ -45,6 +45,17 @@ public void setLogLevel(String logLevel) {
     }
   }
 
+  @ReactMethod
+  public void clearPersistence(String appName, Promise promise) {
+    module.clearPersistence(appName).addOnCompleteListener(task -> {
+      if (task.isSuccessful()) {
+        promise.resolve(null);
+      } else {
+        rejectPromiseFirestoreException(promise, task.getException());
+      }
+    });
+  }
+
   @ReactMethod
   public void disableNetwork(String appName, Promise promise) {
     module.disableNetwork(appName).addOnCompleteListener(task -> {

packages/firestore/ios/RNFBFirestore/RNFBFirestoreModule.m

@@ -103,4 +103,19 @@ + (BOOL)requiresMainQueueSetup {
   resolve([NSNull null]);
 }
 
+RCT_EXPORT_METHOD(clearPersistence:
+  (FIRApp *) firebaseApp
+    : (RCTPromiseResolveBlock) resolve
+    : (RCTPromiseRejectBlock)reject
+) {
+  [[RNFBFirestoreCommon getFirestoreForApp:firebaseApp] clearPersistenceWithCompletion:^(NSError *error) {
+    if (error) {
+      [RNFBFirestoreCommon promiseRejectFirestoreException:reject error:error];
+    } else {
+      resolve(nil);
+    }
+  }];
+}
+
+
 @end

packages/firestore/lib/index.js

@@ -79,6 +79,10 @@ class FirebaseFirestoreModule extends FirebaseModule {
     return new FirestoreWriteBatch(this);
   }
 
+  clearPersistence() {
+    return this.native.clearPersistence();
+  }
+
   collection(collectionPath) {
     if (!isString(collectionPath)) {
       throw new Error(