feat: Add readOnly prop to TextInput component (#34444)

Summary:
This adds the `readOnly` prop to  TextInput as requested on https://github.com/facebook/react-native/issues/34424 mapping the existing `editable` prop to `readOnly` so that `readOnly={false}` maps to `editable={true}` and `readOnly={true}` represents ` editable={false}`. This PR also updates the TextInputExample on the RNTest in order to facilitate the manual QA of this.

## Changelog

[General] [Added] - Add readOnly prop to TextInput component

Pull Request resolved: https://github.com/facebook/react-native/pull/34444

Test Plan:
1. Open the RNTester app and navigate to the TextInput page
2. Test the `TextInput` component through the `Editable and Read only` section

https://user-images.githubusercontent.com/11707729/185295132-036443c8-1d5e-4567-a15e-5f1173cb0526.mov

Reviewed By: lunaleaps

Differential Revision: D38912786

Pulled By: necolas

fbshipit-source-id: faeb59ed8695732be682ec55406a2de0cb7e619a

packages/rn-tester/js/examples/TextInput/TextInputExample.android.js

@@ -148,6 +148,13 @@ const styles = StyleSheet.create({
   singleLineWithHeightTextInput: {
     height: 30,
   },
+  default: {
+    borderWidth: StyleSheet.hairlineWidth,
+    borderColor: '#0f0f0f',
+    flex: 1,
+    fontSize: 13,
+    padding: 4,
+  },
 });
 
 exports.title = 'TextInput';
@@ -347,6 +354,35 @@ exports.examples = ([
       );
     },
   },
+  {
+    title: 'Editable and Read only',
+    render: function (): React.Node {
+      return (
+        <View>
+          <TextInput
+            placeholder="editable text input using editable prop"
+            style={styles.default}
+            editable
+          />
+          <TextInput
+            placeholder="uneditable text input using editable prop"
+            style={styles.default}
+            editable={false}
+          />
+          <TextInput
+            placeholder="editable text input using readOnly prop"
+            style={styles.default}
+            readOnly={false}
+          />
+          <TextInput
+            placeholder="uneditable text input using readOnly prop"
+            style={styles.default}
+            readOnly
+          />
+        </View>
+      );
+    },
+  },
   {
     title: 'Fixed number of lines',
     platform: 'android',