Add ability to view/consider sampling rates in the app

[teeohhem]

The idea should be to show the real volume of logs, taking into account the sampling rate so the data is realistic. This would be nice to apply in any area where we're displaying counts of logs, charts, etc....

[bisho]

Ideally should be used as well not just for count, also in aggregations of other metrics. See how Honeycomb uses the SampleRate: https://docs.honeycomb.io/manage-data-volume/sample/sampled-data-in-honeycomb/

This will open the door to use variable sampling rates. Capture errors 1:1, rest of request 1:100 and still being able to leverage hyperdx to get meaningful data!