[pointer_interceptor] Add performance warning on using pointer interceptor on iOS (#7288)

Add performance warning to package README on using pointer interceptor on iOS.

## Issues

Fixes flutter/flutter#151535

Author: hellohuanlin

packages/pointer_interceptor/pointer_interceptor/CHANGELOG.md

@@ -1,5 +1,6 @@
-## NEXT
+## 0.10.1+2
 
+* Adds performance warning about using multiple pointer interceptors on iOS.
 * Updates minimum supported SDK version to Flutter 3.16/Dart 3.2.
 
 ## 0.10.1+1

packages/pointer_interceptor/pointer_interceptor/README.md

@@ -6,6 +6,8 @@
 
 `PointerInterceptor` is a widget that prevents mouse events from being captured by an underlying [`HtmlElementView`](https://api.flutter.dev/flutter/widgets/HtmlElementView-class.html) in web, or an underlying [`PlatformView`](https://api.flutter.dev/flutter/widgets/PlatformViewLink-class.html) on iOS.
 
+Using multiple `PointerInterceptor` instances on iOS can be slow and increases memory usage due to the performance overhead of the underlying platform view.
+
 ## What is the problem?
 
 When overlaying Flutter widgets on top of `HtmlElementView`/`PlatformView` widgets that respond to mouse gestures (handle clicks, for example), the clicks will be consumed by the `HtmlElementView`/`PlatformView`, and not relayed to Flutter.

packages/pointer_interceptor/pointer_interceptor/pubspec.yaml

@@ -2,7 +2,7 @@ name: pointer_interceptor
 description: A widget to prevent clicks from being swallowed by underlying HtmlElementViews on the web.
 repository: https://github.com/flutter/packages/tree/main/packages/pointer_interceptor/pointer_interceptor
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+pointer_interceptor%22
-version: 0.10.1+1
+version: 0.10.1+2
 
 environment:
   sdk: ^3.2.0