Enabling "process" feature for Prometheus metrics

[bangbaew]

Can you enable "process" feature for Prometheus metrics like this? https://docs.rs/actix-web-prometheus/0.1.2/actix_web_prometheus/

[jtescher]

You should be able to enable this feature in your cargo.toml without needing the feature here. Alternatively if you want to have the crate export the version of prometheus so you don't have to keep it in sync, then adding it in opentelemetry-prometheus would probably be better first.