Add TLS and basic auth

Many exporters use the Prometheus [exporter-toolkit/web package](https://pkg.go.dev/github.com/prometheus/exporter-toolkit@v0.8.1/web) to implement TLS and basic auth.

The only issue is that this library assumes you're using go-kit for logging. I could convert the existing logging to go-kit if that's acceptable.

Start by reviewing the Prometheus exporter-toolkit/web package linked in the issue and the project's existing logging approach. Determine how TLS and basic authentication would fit while resolving whether converting logging to go-kit is acceptable; done means the exporter supports both features with an agreed logging integration.

Written by the indexing model from the issue text.