fix(app-distribution, android): export methods so module loads

previously there were no react methods, so react-native
actually refuses to load the module, but that's unexpected
in certain instances (like rnfbdemo)

packages/app-distribution/android/src/main/java/io/invertase/firebase/appdistribution/ReactNativeFirebaseAppDistributionModule.java

@@ -26,4 +26,28 @@ public class ReactNativeFirebaseAppDistributionModule extends ReactNativeFirebas
   ReactNativeFirebaseAppDistributionModule(ReactApplicationContext reactContext) {
     super(reactContext, TAG);
   }
+
+  @ReactMethod
+  public void isTesterSignedIn(Promise promise) {
+    rejectPromiseWithCodeAndMessage(
+        promise, "platform-unsupported", "Android is not supported for App Distribution");
+  }
+
+  @ReactMethod
+  public void signInTester(Promise promise) {
+    rejectPromiseWithCodeAndMessage(
+        promise, "platform-unsupported", "Android is not supported for App Distribution");
+  }
+
+  @ReactMethod
+  public void checkForUpdate(Promise promise) {
+    rejectPromiseWithCodeAndMessage(
+        promise, "platform-unsupported", "Android is not supported for App Distribution");
+  }
+
+  @ReactMethod
+  public void signOutTester(Promise promise) {
+    rejectPromiseWithCodeAndMessage(
+        promise, "platform-unsupported", "Android is not supported for App Distribution");
+  }
 }

packages/app-distribution/e2e/app-distribution.e2e.js

@@ -16,6 +16,12 @@
  */
 
 describe('appDistribution()', function () {
+  describe('native module is loaded', function () {
+    it('checks native module load status', function () {
+      firebase.appDistribution().native;
+    });
+  });
+
   describe('isTesterSignedIn()', function () {
     it('checks if a tester is signed in', async function () {
       if (device.getPlatform() === 'ios') {