Consider using the converters and JsonClassInfo from s_defaultOptions by cloning

[ahsonkhan]

runtime/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializerOptions.cs

Lines 332 to 343 in d4b06b1

	internal JsonClassInfo GetOrAddClass(Type classType)
	{
	_haveTypesBeenCreated = true;
	// todo: for performance and reduced instances, consider using the converters and JsonClassInfo from s_defaultOptions by cloning (or reference directly if no changes).
	if (!_classes.TryGetValue(classType, out JsonClassInfo? result))
	{
	result = _classes.GetOrAdd(classType, new JsonClassInfo(classType, this));
	}
	return result;
	}

cc @steveharter

[steveharter]

The comment and a cloning approach is feasible, but moving to Future since it will tie together with memory conservation work planned for Future by #1568

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