Mark ReactPackage.getModule as UnstableReactNativeAPI (#39337)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/39337

Mark ReactPackage.getModule as UnstableReactNativeAPI

changelog: [internal] internal

Reviewed By: arushikesarwani94

Differential Revision: D49068233

fbshipit-source-id: 56be5c08eaa5b33c069e540ba452dba30111a64f

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactPackage.java

@@ -12,6 +12,7 @@ import com.facebook.infer.annotation.Nullsafe;
 import com.facebook.react.bridge.NativeModule;
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.common.annotations.DeprecatedInNewArchitecture;
+import com.facebook.react.common.annotations.UnstableReactNativeAPI;
 import com.facebook.react.uimanager.UIManagerModule;
 import com.facebook.react.uimanager.ViewManager;
 import java.util.List;
@@ -56,6 +57,7 @@ public interface ReactPackage {
    * @param reactContext {@link ReactApplicationContext} context for this
    */
   @Nullable
+  @UnstableReactNativeAPI
   default NativeModule getModule(
       @NonNull String name, @NonNull ReactApplicationContext reactContext) {
     return null;