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/attributedstring/TextAttributes.cpp

@@ -62,6 +62,9 @@ void TextAttributes::apply(TextAttributes textAttributes) {
   baseWritingDirection = textAttributes.baseWritingDirection.has_value()
       ? textAttributes.baseWritingDirection
       : baseWritingDirection;
+  lineBreakStrategy = textAttributes.lineBreakStrategy.has_value()
+      ? textAttributes.lineBreakStrategy
+      : lineBreakStrategy;
 
   // Decoration
   textDecorationColor = textAttributes.textDecorationColor
@@ -110,6 +113,7 @@ bool TextAttributes::operator==(const TextAttributes &rhs) const {
              allowFontScaling,
              alignment,
              baseWritingDirection,
+             lineBreakStrategy,
              textDecorationColor,
              textDecorationLineType,
              textDecorationStyle,
@@ -129,6 +133,7 @@ bool TextAttributes::operator==(const TextAttributes &rhs) const {
              rhs.allowFontScaling,
              rhs.alignment,
              rhs.baseWritingDirection,
+             rhs.lineBreakStrategy,
              rhs.textDecorationColor,
              rhs.textDecorationLineType,
              rhs.textDecorationStyle,
@@ -187,6 +192,7 @@ SharedDebugStringConvertibleList TextAttributes::getDebugProps() const {
       debugStringConvertibleItem("lineHeight", lineHeight),
       debugStringConvertibleItem("alignment", alignment),
       debugStringConvertibleItem("baseWritingDirection", baseWritingDirection),
+      debugStringConvertibleItem("lineBreakStrategyIOS", lineBreakStrategy),
 
       // Decoration
       debugStringConvertibleItem("textDecorationColor", textDecorationColor),