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.h

@@ -57,6 +57,7 @@ class TextAttributes : public DebugStringConvertible {
   Float lineHeight{std::numeric_limits<Float>::quiet_NaN()};
   std::optional<TextAlignment> alignment{};
   std::optional<WritingDirection> baseWritingDirection{};
+  std::optional<LineBreakStrategy> lineBreakStrategy{};
 
   // Decoration
   SharedColor textDecorationColor{};
@@ -121,6 +122,7 @@ struct hash<facebook::react::TextAttributes> {
         textAttributes.lineHeight,
         textAttributes.alignment,
         textAttributes.baseWritingDirection,
+        textAttributes.lineBreakStrategy,
         textAttributes.textDecorationColor,
         textAttributes.textDecorationLineType,
         textAttributes.textDecorationStyle,