Add VRChat and GitHub packages to Unity project

Assets/Udon/ProgramSources/Abstract/AbstractSerializedUdonProgramAsset.cs

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+using System.Collections;
+using System.Collections.Generic;
+using JetBrains.Annotations;
+using UnityEngine;
+using VRC.Udon.Common.Interfaces;
+
+namespace VRC.Udon
+{
+    public abstract class AbstractSerializedUdonProgramAsset : ScriptableObject
+    {
+        [PublicAPI]
+        public abstract void StoreProgram(IUdonProgram udonProgram);
+
+        [PublicAPI]
+        public abstract IUdonProgram RetrieveProgram();
+    }
+}