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

ReactCommon/react/renderer/components/text/BaseTextProps.cpp

@@ -105,6 +105,12 @@ static TextAttributes convertRawProp(
       "baseWritingDirection",
       sourceTextAttributes.baseWritingDirection,
       defaultTextAttributes.baseWritingDirection);
+  textAttributes.lineBreakStrategy = convertRawProp(
+      context,
+      rawProps,
+      "lineBreakStrategyIOS",
+      sourceTextAttributes.lineBreakStrategy,
+      defaultTextAttributes.lineBreakStrategy);
 
   // Decoration
   textAttributes.textDecorationColor = convertRawProp(
@@ -243,6 +249,12 @@ void BaseTextProps::setProp(
         textAttributes,
         baseWritingDirection,
         "baseWritingDirection");
+    REBUILD_FIELD_SWITCH_CASE(
+        defaults,
+        value,
+        textAttributes,
+        lineBreakStrategy,
+        "lineBreakStrategyIOS");
     REBUILD_FIELD_SWITCH_CASE(
         defaults,
         value,