Standardise a Prometheus exporter interface for Versatus

[mattgeddes]

This is a top-level issue for the prometheus exporter crate, Vinay. I thought I had created it earlier.

You can add your subtasks as children here:

• Define PrometheusMetricType Enum #642
• Implement PrometheusMetricBuilder #643
• Enhance PrometheusMetricBuilder with Render Interface  #644
• Implement /metrics Endpoint and Serve Rendered Metrics #645
• feat: Integrate TLS Prometheus Web Server #676
• Integrate Protocol Node-Level Metrics #732

[mattgeddes]

This isn't complete yet. We have the crate, but looking at main branch, we still have my old code being called from the storage and compute agents. Let's leave this task open until the functionality is implemented end-to-end.

[mattgeddes]

This was added and merged earlier.