Count by start time instead of end time

[molekp]

Hi

I've notice that Your mechanism is counting time of end of task. This is done in https://github.com/David-Desmaisons/RateLimiter/blob/master/RateLimiter/CountByIntervalAwaitableConstraint.cs#L107

Would you like the ability to optionaly setup counting time on start task?

Example: I have api which consumes 1 request/ 2 seconds. One request takes 5s. Finally I have only 1 request / 5 second, which is slow performance. I wish to send 1r/2s (I don't care of time that request takes)

I am counting on your answer.
Greetings