Fix Issue 10718: Add iOS support for progressViewOffset (#30737)

Summary:
Fixes https://github.com/facebook/react-native/issues/10718, bringing `progressViewOffset` support to iOS.

Thanks to Taylor123 for the initial PR upon which this fix is based.

## Changelog

[iOS] [Fix] - `progressViewOffset` prop of `RefreshControl` and `VirtualizedList` now works on iOS

Pull Request resolved: https://github.com/facebook/react-native/pull/30737

Test Plan:
Tested with quick-and-dirty sample app.

![progressViewOffset-iOS](https://user-images.githubusercontent.com/1563532/104526540-82fe1d80-55b7-11eb-9f99-e025bedf4874.gif)

## Documentation

The corresponding documentation update PR can be found [here](https://github.com/facebook/react-native-website/pull/2441).

Reviewed By: kacieb

Differential Revision: D26813977

Pulled By: sammy-SC

fbshipit-source-id: 45cc5a647d70e44a29c6391b7586cb41ca011bef

Libraries/Components/RefreshControl/PullToRefreshViewNativeComponent.js

@@ -8,7 +8,11 @@
  * @flow strict-local
  */
 
-import type {DirectEventHandler, WithDefault} from '../../Types/CodegenTypes';
+import type {
+  DirectEventHandler,
+  Float,
+  WithDefault,
+} from '../../Types/CodegenTypes';
 import type {ColorValue} from '../../StyleSheet/StyleSheet';
 import type {ViewProps} from '../View/ViewPropTypes';
 import * as React from 'react';
@@ -32,6 +36,10 @@ type NativeProps = $ReadOnly<{|
    * The title displayed under the refresh indicator.
    */
   title?: WithDefault<string, null>,
+  /**
+   * Progress view top offset
+   */
+  progressViewOffset?: WithDefault<Float, 0>,
 
   /**
    * Called when the view starts refreshing.