Expose hash as part of text localdata

Summary: In this diff we expose the text local data hash to android, this will be used in the future to cache metadata when rendering text in android

Reviewed By: shergin

Differential Revision: D13161873

fbshipit-source-id: cd13a4beba75a3fe62ac9ff3def26f88e874834b

ReactCommon/fabric/attributedstring/conversions.h

@@ -487,6 +487,8 @@ inline folly::dynamic toDynamic(const AttributedString &attributedString) {
     fragments.push_back(dynamicFragment);
   }
   value("fragments", fragments);
+  value(
+      "hash", std::hash<facebook::react::AttributedString>{}(attributedString));
   value("string", attributedString.getString());
   return value;
 }

ReactCommon/fabric/components/text/paragraph/conversions.h

@@ -14,6 +14,7 @@ inline folly::dynamic toDynamic(const ParagraphLocalData &paragraphLocalData) {
   folly::dynamic newLocalData = folly::dynamic::object();
   newLocalData["attributedString"] =
       toDynamic(paragraphLocalData.getAttributedString());
+  newLocalData["hash"] = newLocalData["attributedString"]["hash"];
   return newLocalData;
 }