Add ReactPackage.getModule method (facebook#39336)

Summary:
Pull Request resolved: facebook#39336

We are introducing the new getModule method into the ReactPackage interface following the "Registration of Native Modules" design

This method defaults to true with the goal to avoid compatibility breakage

changelog: [Android][Changed] Introducing getModule method into ReactPackage interface, defaulting to null. This method will be used in the Stable API of React Native

Reviewed By: cortinico

Differential Revision: D48992720

fbshipit-source-id: 5a44b795b2e8032c8b865acc12325616ece060ee

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

@@ -14,6 +14,7 @@
 import com.facebook.react.uimanager.UIManagerModule;
 import com.facebook.react.uimanager.ViewManager;
 import java.util.List;
+import javax.annotation.Nullable;
 
 /**
  * Main interface for providing additional capabilities to the catalyst framework by couple of
@@ -44,4 +45,16 @@ public interface ReactPackage {
   /** @return a list of view managers that should be registered with {@link UIManagerModule} */
   @NonNull
   List<ViewManager> createViewManagers(@NonNull ReactApplicationContext reactContext);
+
+  /**
+   * Given a module name, it returns an instance of {@link NativeModule} for the name
+   *
+   * @param name name of the Native Module
+   * @param reactContext {@link ReactApplicationContext} context for this
+   */
+  @Nullable
+  default NativeModule getModule(
+      @NonNull String name, @NonNull ReactApplicationContext reactContext) {
+    return null;
+  }
 }

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

@@ -7,6 +7,7 @@
 
 package com.facebook.react;
 
+import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import com.facebook.react.bridge.ModuleHolder;
 import com.facebook.react.bridge.ModuleSpec;
@@ -41,8 +42,9 @@ public List<NativeModule> createNativeModules(ReactApplicationContext reactConte
    * @param name name of the Native Module
    * @param reactContext {@link ReactApplicationContext} context for this
    */
+  @Override
   public abstract @Nullable NativeModule getModule(
-      String name, final ReactApplicationContext reactContext);
+      @NonNull String name, @NonNull ReactApplicationContext reactContext);
 
   /**
    * This is a temporary method till we implement TurboModules. Once we implement TurboModules, we