Introduce IViewGroupManager

Summary:
In this diff I'm introducing IViewGroupManager to extract methods required to add/remove views from a viewGroup

This will be used by ViewManagers that require to add views but don't depend on ViewGroupmanager

changelog: [internal] internal

Reviewed By: javache

Differential Revision: D41386920

fbshipit-source-id: a7d893d92d0f12766dcc71dfd1b22539c3b9687d

ReactAndroid/src/main/java/com/facebook/react/uimanager/IViewGroupManager.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.uimanager;
+
+import android.view.View;
+
+/** Interface providing children management API for view managers of classes extending ViewGroup. */
+public interface IViewGroupManager<T extends View> extends IViewManagerWithChildren {
+
+  /** Adds a child view into the parent at the index specified as a parameter */
+  void addView(T parent, View child, int index);
+
+  /** @return child of the parent view at the index specified as a parameter. */
+  View getChildAt(T parent, int index);
+
+  /** Removes View from the parent View at the index specified as a parameter. */
+  void removeViewAt(T parent, int index);
+
+  /** Return the amount of children contained by the view specified as a parameter. */
+  int getChildCount(T parent);
+}