Remove capture of EventId to reduce constant boxing

[snakefoot]

There are the following lines (Where "EventId" is boxing):

NLog.Extensions.Logging/src/NLog.Extensions.Logging/Logging/NLogLogger.cs

Lines 341 to 344 in 407e66f

	var idIsZero = eventId.Id == 0;
	eventInfo.Properties[eventIdPropertyNames.Item2] = idIsZero ? ZeroEventId : eventId.Id;
	eventInfo.Properties[eventIdPropertyNames.Item3] = eventId.Name;
	eventInfo.Properties["EventId"] = idIsZero && eventId.Name == null ? EmptyEventId : eventId;

I would like to change it to this instead to reduce allocation:

if (eventId.Id != 0)
   eventInfo.Properties[eventIdPropertyNames.Item2] = eventId.Id;
if (!string.IsNullOrEmpty(eventId.Name))
   eventInfo.Properties[eventIdPropertyNames.Item3] = eventId.Name;

Maybe have it as configuration setting, where the default is to reduce allocation.