Make sampling frequency a config #2744

Alright, this is possible, but we'll make this an optional config that still defaults to 101, I'll ship a PR later this week for that. I'll need to verify that normal payloads aren't way too oversized otherwise the event will just be dropped by the server.

Originally posted by @sl0thentr0py in #2742 (comment)

• also seems vernier is not at 101, so we need to fix that