Initial Client/Server Communication

#1
Followed the MagicOnion quickstart guide, borrowing code from the chat sample app to get something working

Assets/Scripts/MessagePack/Resolvers/PrimitiveObjectResolver.cs

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+// Copyright (c) All contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using MessagePack.Formatters;
+
+namespace MessagePack.Resolvers
+{
+    public sealed class PrimitiveObjectResolver : IFormatterResolver
+    {
+        /// <summary>
+        /// The singleton instance that can be used.
+        /// </summary>
+        public static readonly PrimitiveObjectResolver Instance;
+
+        /// <summary>
+        /// A <see cref="MessagePackSerializerOptions"/> instance with this formatter pre-configured.
+        /// </summary>
+        public static readonly MessagePackSerializerOptions Options;
+
+        static PrimitiveObjectResolver()
+        {
+            Instance = new PrimitiveObjectResolver();
+            Options = new MessagePackSerializerOptions(Instance);
+        }
+
+        private PrimitiveObjectResolver()
+        {
+        }
+
+        public IMessagePackFormatter<T> GetFormatter<T>()
+        {
+            return FormatterCache<T>.Formatter;
+        }
+
+        private static class FormatterCache<T>
+        {
+            public static readonly IMessagePackFormatter<T> Formatter;
+
+            static FormatterCache()
+            {
+                Formatter = (typeof(T) == typeof(object))
+                    ? (IMessagePackFormatter<T>)(object)PrimitiveObjectFormatter.Instance
+                    : null;
+            }
+        }
+    }
+
+    ////#if !UNITY_2018_3_OR_NEWER
+
+    ////    /// <summary>
+    ////    /// In `object`, when serializing resolve by concrete type and when deserializing use primitive.
+    ////    /// </summary>
+    ////    public sealed class DynamicObjectTypeFallbackResolver : IFormatterResolver
+    ////    {
+    ////        public static readonly DynamicObjectTypeFallbackResolver Instance = new DynamicObjectTypeFallbackResolver();
+
+    ////        DynamicObjectTypeFallbackResolver()
+    ////        {
+
+    ////        }
+
+    ////        public IMessagePackFormatter<T> GetFormatter<T>()
+    ////        {
+    ////            return FormatterCache<T>.formatter;
+    ////        }
+
+    ////        static class FormatterCache<T>
+    ////        {
+    ////            public static readonly IMessagePackFormatter<T> formatter;
+
+    ////            static FormatterCache()
+    ////            {
+    ////                formatter = (typeof(T) == typeof(object))
+    ////                    ? (IMessagePackFormatter<T>)(object)DynamicObjectTypeFallbackFormatter.Instance
+    ////                    : null;
+    ////            }
+    ////        }
+    ////    }
+
+    ////#endif
+}