stopAndSendDurationSignal should expose `floatValue`

[juanarzola]

I'd be great to be able to measure and also send a numeric value in the same signal. Use case: I am tracking the time to import cards. I currently track the number of imported cards in the properties dictionary (grouped by card type), but this is a string, so I can't do any aggregations with them. With floatValue, I can at least do aggregations with the total count.

[Jeehut]

@juanarzola Thank you for requesting this and explaining the use case! This makes total sense and I will make sure to add back the floatValue field back to the stop function. Stay tuned!

[Jeehut]

@juanarzola I fixed this in #241, which is available in the new release 2.9.2. 🎉