feat(iOS): added lineBreakStrategy attribute to Text/TextInput (#31272)

Summary:
iOS did not support the implementation of Korean word-wrap(line-break) before iOS14.
If the attribute applied, the word-wrap of Korean will works.

## Changelog

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[iOS] [Added] -  Line break strategy for Text and TextInput components

Pull Request resolved: https://github.com/facebook/react-native/pull/31272

Test Plan:
1. Test build and run on above iOS 14.
2. Test it does not affect existing text components when set default(none) strategy.
3. Test whether word-wrap works with Korean when set hangul-word strategy.

<img src="https://user-images.githubusercontent.com/26326015/112963967-d7f70c00-9182-11eb-9a34-8c758b80c219.png" width="300" height="" style="max-width:100%;">

Reviewed By: javache

Differential Revision: D39824809

Pulled By: lunaleaps

fbshipit-source-id: 42cb0385221a38c84e80d3494d1bfc1934ecf32b

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

@@ -862,4 +862,43 @@ exports.examples = ([
       );
     },
   },
+  {
+    title: 'Line Break Strategy',
+    render: function (): React.Node {
+      const lineBreakStrategy = ['none', 'standard', 'hangul-word', 'push-out'];
+      const textByCode = {
+        en: 'lineBreakStrategy lineBreakStrategy lineBreakStrategy lineBreakStrategy',
+        ko: '한글개행한글개행 한글개행한글개행 한글개행한글개행 한글개행한글개행 한글개행한글개행 한글개행한글개행',
+        ja: 'かいぎょう かいぎょう かいぎょう かいぎょう かいぎょう かいぎょう',
+        cn: '改行 改行 改行 改行 改行 改行 改行 改行 改行 改行 改行 改行',
+      };
+      return (
+        <View>
+          {lineBreakStrategy.map(strategy => {
+            return (
+              <View key={strategy} style={{marginBottom: 12}}>
+                <Text
+                  style={{
+                    backgroundColor: 'lightgrey',
+                  }}>{`Strategy: ${strategy}`}</Text>
+                {Object.keys(textByCode).map(code => {
+                  return (
+                    <View key={code}>
+                      <Text style={{fontWeight: 'bold'}}>{`[${code}]`}</Text>
+                      <TextInput
+                        multiline
+                        lineBreakStrategyIOS={strategy}
+                        style={styles.default}
+                        defaultValue={textByCode[code]}
+                      />
+                    </View>
+                  );
+                })}
+              </View>
+            );
+          })}
+        </View>
+      );
+    },
+  },
 ]: Array<RNTesterModuleExample>);