Added Support for Entrance/exit from collection by Flatlist (#31630)

Summary:
Issue https://github.com/facebook/react-native/issues/30964 .When using a screen reader, flatlist does not announce entrance/ exit from the flat list.

## Changelog

[Android] [Changed] - Added support for accessibility role of "list" for flatlist and sectioned list

Pull Request resolved: https://github.com/facebook/react-native/pull/31630

Test Plan: I have added accessibility role prop in flatlist and sectioned list in rntester app, that will announce entrance/ exit from flatlist and sectioned list.

Reviewed By: kacieb

Differential Revision: D29599351

Pulled By: blavalla

fbshipit-source-id: e16ec69a694780d12f15f88a1e6bb5d7d77ac15f

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

@@ -107,6 +107,7 @@ public class ReactAccessibilityDelegate extends AccessibilityDelegateCompat {
     TAB,
     TABLIST,
     TIMER,
+    LIST,
     TOOLBAR;
 
     public static String getValue(AccessibilityRole role) {
@@ -135,6 +136,8 @@ public class ReactAccessibilityDelegate extends AccessibilityDelegateCompat {
           return "android.widget.SpinButton";
         case SWITCH:
           return "android.widget.Switch";
+        case LIST:
+          return "android.widget.AbsListView";
         case NONE:
         case LINK:
         case SUMMARY: