bountx / LOB / 22830014534

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Add subscriber server metrics and update Grafana dashboards (#26)

* Add subscriber server metrics and update Grafana dashboards

- Introduced SubscriberStats struct to capture metrics for connected clients, active subscriptions, messages sent, and backpressure disconnects.
- Enhanced SubscriberServer to provide a snapshot of subscriber metrics.
- Updated MetricsServer to include subscriber stats in Prometheus output.
- Created a new Grafana dashboard for LOB Subscribers with relevant metrics visualizations.
- Modified existing LOB Ingest Pipeline dashboard to include links to the new Subscribers dashboard and updated descriptions for clarity.

* Skip process-level metrics without labels in Prometheus format tests

* pre-commit

* Update Grafana dashboard expressions and improve metrics handling

- Adjusted Prometheus expression to prevent division by zero in Grafana dashboard.
- Enhanced average processing time calculation in main.cpp for better precision.
- Added error handling for RSS byte reading in prometheus_format.hpp.
- Modified subscriber_server.hpp to track backpressure clients more effectively.

* Update Grafana dashboard metrics expressions and enhance Prometheus memory reporting

* Remove outdated comments from readRssBytes function in prometheus_format.hpp

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Co-authored-by: Andrzej Pijanowski <apijanowski@cloudferro.com>

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