Refactor serialization copying to use source generators (#19412)

Content.Shared/Tag/TagComponent.cs

@@ -3,10 +3,10 @@
 namespace Content.Shared.Tag
 {
     [RegisterComponent, Access(typeof(TagSystem))]
-    public sealed class TagComponent : Component
+    public sealed partial class TagComponent : Component
     {
         [DataField("tags", customTypeSerializer: typeof(PrototypeIdHashSetSerializer<TagPrototype>))]
         [Access(typeof(TagSystem), Other = AccessPermissions.ReadExecute)] // FIXME Friends
-        public readonly HashSet<string> Tags = new();
+        public HashSet<string> Tags = new();
     }
 }

Content.Shared/Tag/TagPrototype.cs

@@ -12,6 +12,6 @@ namespace Content.Shared.Tag
     {
         [ViewVariables]
         [IdDataField]
-        public string ID { get; } = default!;
+        public string ID { get; private set; } = default!;
     }
 }