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/NativeDateTimeResolver.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 System;
+using MessagePack.Formatters;
+using MessagePack.Internal;
+
+#pragma warning disable SA1403 // File may only contain a single namespace
+
+namespace MessagePack.Resolvers
+{
+    public sealed class NativeDateTimeResolver : IFormatterResolver
+    {
+        /// <summary>
+        /// The singleton instance that can be used.
+        /// </summary>
+        public static readonly NativeDateTimeResolver Instance;
+
+        /// <summary>
+        /// A <see cref="MessagePackSerializerOptions"/> instance with this formatter pre-configured.
+        /// </summary>
+        public static readonly MessagePackSerializerOptions Options;
+
+        static NativeDateTimeResolver()
+        {
+            Instance = new NativeDateTimeResolver();
+            Options = new MessagePackSerializerOptions(Instance);
+        }
+
+        private NativeDateTimeResolver()
+        {
+        }
+
+        public IMessagePackFormatter<T> GetFormatter<T>()
+        {
+            return FormatterCache<T>.Formatter;
+        }
+
+        private static class FormatterCache<T>
+        {
+            public static readonly IMessagePackFormatter<T> Formatter;
+
+            static FormatterCache()
+            {
+                Formatter = (IMessagePackFormatter<T>)NativeDateTimeResolverGetFormatterHelper.GetFormatter(typeof(T));
+            }
+        }
+    }
+}
+
+namespace MessagePack.Internal
+{
+    internal static class NativeDateTimeResolverGetFormatterHelper
+    {
+        internal static object GetFormatter(Type t)
+        {
+            if (t == typeof(DateTime))
+            {
+                return NativeDateTimeFormatter.Instance;
+            }
+            else if (t == typeof(DateTime?))
+            {
+                return new StaticNullableFormatter<DateTime>(NativeDateTimeFormatter.Instance);
+            }
+            else if (t == typeof(DateTime[]))
+            {
+                return NativeDateTimeArrayFormatter.Instance;
+            }
+
+            return null;
+        }
+    }
+}