Revert "Use source generated json serializers in order to improve code trimming (#4094)" (#4576)

This reverts commit 4ce4299ca2.

Ryujinx.Common/Utilities/TypedStringEnumConverter.cs

@@ -1,34 +0,0 @@
-#nullable enable
-using System;
-using System.Text.Json;
-using System.Text.Json.Serialization;
-
-namespace Ryujinx.Common.Utilities
-{
-    /// <summary>
-    /// Specifies that value of <see cref="TEnum"/> will be serialized as string in JSONs
-    /// </summary>
-    /// <remarks>
-    /// Trimming friendly alternative to <see cref="JsonStringEnumConverter"/>.
-    /// Get rid of this converter if dotnet supports similar functionality out of the box.
-    /// </remarks>
-    /// <typeparam name="TEnum">Type of enum to serialize</typeparam>
-    public sealed class TypedStringEnumConverter<TEnum> : JsonConverter<TEnum> where TEnum : struct, Enum
-    {
-        public override TEnum Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
-        {
-            var enumValue = reader.GetString();
-            if (string.IsNullOrEmpty(enumValue))
-            {
-                return default;
-            }
-
-            return Enum.Parse<TEnum>(enumValue);
-        }
-
-        public override void Write(Utf8JsonWriter writer, TEnum value, JsonSerializerOptions options)
-        {
-            writer.WriteStringValue(value.ToString());
-        }
-    }
-}