Removed TypedStringEnumConverter; it exists in .NET now.

As per the remark XMLdoc on the type: Get rid of this converter if dotnet supports similar functionality out of the box.

src/Ryujinx.Common/Utilities/TypedStringEnumConverter.cs

@@ -1,37 +0,0 @@
-#nullable enable
-using Ryujinx.Common.Logging;
-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)
-        {
-            string? enumValue = reader.GetString();
-
-            if (Enum.TryParse(enumValue, out TEnum value))
-            {
-                return value;
-            }
-
-            Logger.Warning?.Print(LogClass.Configuration, $"Failed to parse enum value \"{enumValue}\" for {typeof(TEnum)}, using default \"{default(TEnum)}\"");
-            return default;
-        }
-
-        public override void Write(Utf8JsonWriter writer, TEnum value, JsonSerializerOptions options)
-        {
-            writer.WriteStringValue(value.ToString());
-        }
-    }
-}