Rename StringIdentifiable.Codec to StringIdentifiable.EnumCodec (#3639)

mappings/net/minecraft/util/StringIdentifiable.mapping

@@ -5,6 +5,7 @@ CLASS net/minecraft/class_3542 net/minecraft/util/StringIdentifiable
 	COMMENT @apiNote To make an enum serializable with codecs, implement this on the enum class,
 	COMMENT implement {@link #asString} to return a unique ID, and add a {@code static final}
 	COMMENT field that holds {@linkplain #createCodec the codec for the enum}.
+	FIELD field_38377 CACHED_MAP_THRESHOLD I
 	METHOD method_15434 asString ()Ljava/lang/String;
 		COMMENT {@return the unique string representation of the enum, used for serialization}
 	METHOD method_28140 createCodec (Ljava/util/function/Supplier;)Lnet/minecraft/class_3542$class_7292;
@@ -31,7 +32,7 @@ CLASS net/minecraft/class_3542 net/minecraft/util/StringIdentifiable
 	CLASS 1
 		METHOD keys (Lcom/mojang/serialization/DynamicOps;)Ljava/util/stream/Stream;
 			ARG 1 ops
-	CLASS class_7292 Codec
+	CLASS class_7292 EnumCodec
 		FIELD field_38378 base Lcom/mojang/serialization/Codec;
 		FIELD field_38379 idToIdentifiable Ljava/util/function/Function;
 		METHOD <init> ([Ljava/lang/Enum;Ljava/util/function/Function;)V