Add accessibilityRole to RCTAttributedTextUtils

Summary:
Changelog:
[Internal] - Add `accessibilityRole` to `RCTAttributedTextUtils`. AccessibilityRole was in `TextAttributes` which is a Fabric's abstraction so cannot be detected when enumerating attributedString.  Mapping accessibilityRole from `TextAttributes` to `NSAttributedString` could provide the attributeName when iterating over attributedString and then successfully find the range of the fragment whose `accessibilityRole` has value @"link".

Reviewed By: shergin

Differential Revision: D22286747

fbshipit-source-id: eb039d6a35e77d1860f86ba287391ccb56fbe7b5

ReactCommon/fabric/textlayoutmanager/platform/ios/RCTAttributedTextUtils.h

@@ -15,6 +15,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 NSString *const RCTAttributedStringIsHighlightedAttributeName = @"IsHighlighted";
 NSString *const RCTAttributedStringEventEmitterKey = @"EventEmitter";
+NSString *const RCTTextAttributesAccessibilityRoleAttributeName = @"AccessibilityRole";
 
 /*
  * Creates `NSTextAttributes` from given `facebook::react::TextAttributes`

ReactCommon/fabric/textlayoutmanager/platform/ios/RCTAttributedTextUtils.mm

@@ -212,6 +212,11 @@ NSDictionary<NSAttributedStringKey, id> *RCTNSTextAttributesFromTextAttributes(T
     attributes[RCTAttributedStringIsHighlightedAttributeName] = @YES;
   }
 
+  if (!textAttributes.accessibilityRole.empty()) {
+    attributes[RCTTextAttributesAccessibilityRoleAttributeName] =
+        [NSString stringWithCString:textAttributes.accessibilityRole.c_str() encoding:NSUTF8StringEncoding];
+  }
+
   return [attributes copy];
 }