fix: dispatch ContentSizeChange event on Fabric on iOS (#35816)

Summary:
On Fabric, `onContentSizeChange` of `TextInput` component was never fired on `iOS`, since the logic dispatching it was implemented in `RCTBaseTextInputShadowView` on Paper: https://github.com/facebook/react-native/blob/0f8dc067ac079f7b14696cfcafa37e3ec19a0409/Libraries/Text/TextInput/RCTBaseTextInputShadowView.m#L105. This class is not used on Fabric, therefore the event was never dispatched. On Paper, it was dispatched in `dirtyLayout` method,  so I added dispatching of this event based on the change of content size in `layoutSubviews` method, since this method seems the closest one on Fabric. I am not sure if it is the best place for it though.

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[IOS] [ADDED] - dispatch `onContentSizeChange` event on Fabric.

Pull Request resolved: #35816

Test Plan:
Try to use `onContentSizeChange` callback in `TextInput` component:
```tsx
import React from 'react';
import {TextInput, SafeAreaView} from 'react-native';

const App = () => {
  return (
    <SafeAreaView style={{flex: 1, backgroundColor: 'red'}}>
      <TextInput
        multiline={true}
        placeholder="type here"
        onContentSizeChange={e => console.log(e)}
      />
    </SafeAreaView>
  );
};

export default App;

```

Reviewed By: christophpurrer

Differential Revision: D42499974

Pulled By: sammy-SC

fbshipit-source-id: 3e010ff096cf91cb3e7b87ed2753e9d0e7be9650

React/Fabric/Mounting/ComponentViews/TextInput/RCTTextInputComponentView.mm

@@ -245,6 +245,11 @@ - (void)updateLayoutMetrics:(LayoutMetrics const &)layoutMetrics
       UIEdgeInsetsInsetRect(self.bounds, RCTUIEdgeInsetsFromEdgeInsets(layoutMetrics.borderWidth));
   _backedTextInputView.textContainerInset =
       RCTUIEdgeInsetsFromEdgeInsets(layoutMetrics.contentInsets - layoutMetrics.borderWidth);
+
+  if (_eventEmitter) {
+    auto const &textInputEventEmitter = *std::static_pointer_cast<TextInputEventEmitter const>(_eventEmitter);
+    textInputEventEmitter.onContentSizeChange([self _textInputMetrics]);
+  }
 }
 
 - (void)prepareForRecycle

ReactCommon/react/renderer/components/textinput/iostextinput/TextInputEventEmitter.cpp

@@ -36,6 +36,23 @@ static jsi::Value textInputMetricsPayload(
   return payload;
 };
 
+static jsi::Value textInputMetricsContentSizePayload(
+    jsi::Runtime &runtime,
+    TextInputMetrics const &textInputMetrics) {
+  auto payload = jsi::Object(runtime);
+
+  {
+    auto contentSize = jsi::Object(runtime);
+    contentSize.setProperty(
+        runtime, "width", textInputMetrics.contentSize.width);
+    contentSize.setProperty(
+        runtime, "height", textInputMetrics.contentSize.height);
+    payload.setProperty(runtime, "contentSize", contentSize);
+  }
+
+  return payload;
+};
+
 static jsi::Value keyPressMetricsPayload(
     jsi::Runtime &runtime,
     KeyPressMetrics const &keyPressMetrics) {
@@ -82,7 +99,8 @@ void TextInputEventEmitter::onChangeSync(
 
 void TextInputEventEmitter::onContentSizeChange(
     TextInputMetrics const &textInputMetrics) const {
-  dispatchTextInputEvent("contentSizeChange", textInputMetrics);
+  dispatchTextInputContentSizeChangeEvent(
+      "contentSizeChange", textInputMetrics);
 }
 
 void TextInputEventEmitter::onSelectionChange(
@@ -137,4 +155,16 @@ void TextInputEventEmitter::dispatchTextInputEvent(
       priority);
 }
 
+void TextInputEventEmitter::dispatchTextInputContentSizeChangeEvent(
+    std::string const &name,
+    TextInputMetrics const &textInputMetrics,
+    EventPriority priority) const {
+  dispatchEvent(
+      name,
+      [textInputMetrics](jsi::Runtime &runtime) {
+        return textInputMetricsContentSizePayload(runtime, textInputMetrics);
+      },
+      priority);
+}
+
 } // namespace facebook::react

ReactCommon/react/renderer/components/textinput/iostextinput/TextInputEventEmitter.h

@@ -54,6 +54,11 @@ class TextInputEventEmitter : public ViewEventEmitter {
       std::string const &name,
       TextInputMetrics const &textInputMetrics,
       EventPriority priority = EventPriority::AsynchronousBatched) const;
+
+  void dispatchTextInputContentSizeChangeEvent(
+      std::string const &name,
+      TextInputMetrics const &textInputMetrics,
+      EventPriority priority = EventPriority::AsynchronousBatched) const;
 };
 
 } // namespace react