HTTP Request log sampling

HTTP logs are only written if the Debug level is enabled, or if a request results in a non-2XX response.
We should change this to allow logging of 2XX responses with some level of sampling when Debug is not enabled.

A [BurstSampler](https://pkg.go.dev/github.com/rs/zerolog#BurstSampler) may be a good fit for this as it would limit the logs emitted during during activity spikes.