Add VRChat and GitHub packages to Unity project

Assets/Udon/Serialization/OdinSerializer/Utilities/Misc/ICacheNotificationReceiver.cs

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+//-----------------------------------------------------------------------
+// <copyright file="ICacheNotificationReceiver.cs" company="Sirenix IVS">
+// Copyright (c) 2018 Sirenix IVS
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace VRC.Udon.Serialization.OdinSerializer.Utilities
+{
+    /// <summary>
+    /// Provides notification callbacks for values that are cached using the <see cref="Cache{T}"/> class.
+    /// </summary>
+    public interface ICacheNotificationReceiver
+    {
+        /// <summary>
+        /// Called when the cached value is freed.
+        /// </summary>
+        void OnFreed();
+
+        /// <summary>
+        /// Called when the cached value is claimed.
+        /// </summary>
+        void OnClaimed();
+    }
+}