emoji: Add EmojiStore.getUnicodeEmojiNameByCode method

Author: sm-sayedi

lib/model/emoji.dart

@@ -119,6 +119,8 @@ mixin EmojiStore {
 
   Iterable<EmojiCandidate> allEmojiCandidates();
 
+  String? getUnicodeEmojiNameByCode(String emojiCode);
+
   // TODO cut debugServerEmojiData once we can query for lists of emoji;
   //   have tests make those queries end-to-end
   Map<String, List<String>>? get debugServerEmojiData;
@@ -374,6 +376,10 @@ class EmojiStoreImpl extends PerAccountStoreBase with EmojiStore {
     return _allEmojiCandidates ??= _generateAllCandidates();
   }
 
+  @override
+  String? getUnicodeEmojiNameByCode(String emojiCode) =>
+    _serverEmojiData?[emojiCode]?.first;
+
   @override
   void setServerEmojiData(ServerEmojiData data) {
     _serverEmojiData = data.codeToNames;

lib/model/store.dart

@@ -658,6 +658,10 @@ class PerAccountStore extends PerAccountStoreBase with
   @override
   Iterable<EmojiCandidate> allEmojiCandidates() => _emoji.allEmojiCandidates();
 
+  @override
+  String? getUnicodeEmojiNameByCode(String emojiCode) =>
+    _emoji.getUnicodeEmojiNameByCode(emojiCode);
+
   EmojiStoreImpl _emoji;
 
   ////////////////////////////////