Support strong typed JsonStringEnumConverter in HasStringEnumConverter

[GZTimeWalker]

currently, the HasStringEnumConverter will ignore strong typed JsonStringEnumConverter like JsonStringEnumConverter<TEnum>

NJsonSchema/src/NJsonSchema/Generation/ReflectionServiceBase.cs

Lines 340 to 357 in 9bf8f69

	private static bool HasStringEnumConverter(ContextualType contextualType)
	{
	dynamic? jsonConverterAttribute = contextualType
	.GetContextOrTypeAttributes(true)?
	.FirstOrDefault(a => a.GetType().Name == "JsonConverterAttribute");
	if (jsonConverterAttribute != null && ObjectExtensions.HasProperty(jsonConverterAttribute, "ConverterType"))
	{
	var converterType = jsonConverterAttribute?.ConverterType as Type;
	if (converterType != null)
	{
	return converterType.IsAssignableToTypeName("StringEnumConverter", TypeNameStyle.Name) ||
	converterType.IsAssignableToTypeName("System.Text.Json.Serialization.JsonStringEnumConverter", TypeNameStyle.FullName);
	}
	}
	return false;
	}

The attribute has the ConverType with:

FullName: System.Text.Json.Serialization.JsonStringEnumConverter`1[[...]
Name: JsonStringEnumConverter`1