Create EnumCache json converter

Author: IExploitableMan

src/Json/EnumCacheJson.cs

@@ -0,0 +1,18 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace PolyMod.Json
+{
+    internal class EnumCacheJson<T> : JsonConverter<T> where T : struct, Enum
+    {
+        public override T Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            return EnumCache<T>.GetType(reader.GetString());
+        }
+
+        public override void Write(Utf8JsonWriter writer, T value, JsonSerializerOptions options)
+        {
+            writer.WriteStringValue(EnumCache<T>.GetName(value));
+        }
+    }
+}