Adding grid role to ViewAccessibility to fix flow errors. (#34267)

Summary:
Adding grid role to ViewAccessibility to fix flow errors.
fixes https://github.com/facebook/react-native/issues/30861 fixes https://github.com/facebook/react-native/issues/30972

## Changelog

[General] [Fixed] - Adding grid role to ViewAccessibility to fix flow errors.

Pull Request resolved: https://github.com/facebook/react-native/pull/34267

Test Plan:
<details><summary>flow error for missing accessibilityRole type grid</summary>
<p>

<image src="https://user-images.githubusercontent.com/24992535/180728969-beccb7f7-d882-4a94-831d-1c08822fc030.png" width="800" />
</p>
</details>

<details><summary>adding grid role to ScrollView</summary>
<p>

https://user-images.githubusercontent.com/24992535/180721100-62de76af-ea23-44a6-816e-f6fa39835b77.mp4
</p>
</details>

<details><summary>adding grid role to FlatList</summary>
<p>

https://user-images.githubusercontent.com/24992535/180724852-861c2981-0b06-4c66-a983-0017785062fe.mp4
</p>
</details>

<details><summary>adding grid role to SectionList</summary>
<p>

https://user-images.githubusercontent.com/24992535/180788810-d1869381-1e6b-42aa-b9b2-a84aece41326.mp4
</p>
</details>

Reviewed By: NickGerleman

Differential Revision: D38121921

Pulled By: dmitryrykun

fbshipit-source-id: 3bc335b3a525e75ae2e032f6a35540b3e95cd6a8

Libraries/Components/View/ViewAccessibility.js

@@ -43,7 +43,8 @@ export type AccessibilityRole =
   | 'tablist'
   | 'timer'
   | 'list'
-  | 'toolbar';
+  | 'toolbar'
+  | 'grid';
 
 // the info associated with an accessibility action
 export type AccessibilityActionInfo = $ReadOnly<{

packages/rn-tester/js/examples/ScrollView/ScrollViewExample.js

@@ -205,6 +205,7 @@ const examples = ([
       return (
         <View>
           <ScrollView
+            accessibilityRole="grid"
             ref={scrollView => {
               _scrollView = scrollView;
             }}