Add VRChat and GitHub packages to Unity project

Assets/Udon/Serialization/Formatters/UdonGameObjectComponentReferenceFormatter.cs

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+using System;
+using VRC.Udon.Common;
+using VRC.Udon.Serialization.OdinSerializer;
+using VRC.Udon.Serialization.Formatters;
+
+[assembly: RegisterFormatter(typeof(UdonGameObjectComponentReferenceFormatter))]
+
+namespace VRC.Udon.Serialization.Formatters
+{
+    public sealed class UdonGameObjectComponentReferenceFormatter : BaseFormatter<UdonGameObjectComponentHeapReference>
+    {
+        private static readonly Serializer<Type> _typeSerializer = Serializer.Get<Type>();
+
+        protected override UdonGameObjectComponentHeapReference GetUninitializedObject()
+        {
+            return null;
+        }
+
+        // ReSharper disable once RedundantAssignment
+        protected override void DeserializeImplementation(ref UdonGameObjectComponentHeapReference value, IDataReader reader)
+        {
+            Type type = _typeSerializer.ReadValue(reader);
+
+            value = new UdonGameObjectComponentHeapReference(type);
+
+            RegisterReferenceID(value, reader);
+            InvokeOnDeserializingCallbacks(ref value, reader.Context);
+        }
+
+        protected override void SerializeImplementation(ref UdonGameObjectComponentHeapReference value, IDataWriter writer)
+        {
+            _typeSerializer.WriteValue(value.type, writer);
+        }
+    }
+}