refactor!: metrics (#2464)

## Description

- Cleans up stale counters
- Introduces unique daily node counts on relays
- Introduces a metrics dumper so we can create dumps of metrics and also
view them in doctor plot
- Introduces new trace level counters

## Breaking Changes

- Introduces `metrics_dump_path` on the top level CLI parameters, which
if set will make sure metrics are collected at regular intervals and
written to the provided path in CSV format.

## Notes & open questions

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## Change checklist

- [ ] Self-review.
- [ ] Documentation updates following the [style
guide](https://rust-lang.github.io/rfcs/1574-more-api-documentation-conventions.html#appendix-a-full-conventions-text),
if relevant.
- [ ] Tests if relevant.
- [ ] All breaking changes documented.