feat: Metrics for Prometheus

[bonddim]

The main purpose of this feature is to add in-app support for Prometheus metrics.
It will be useful for those who use Prometheus and Grafana for monitoring and alerting.

Prometheus Metrics Support:

• Integrated the metrics server into the main application logic.
• Used already gathered statistics for metrics.
• Exposing separate port with /metrics route.

Helm Chart Updates:

• Updated the chart version badge and added metrics-related configuration options.
• Added a utility function for merging YAML templates.
• Added templates for Prometheus monitoring resources.

PS: I'll add the Grafana dashboard after it is stabilized.

[h44z]

nice one =)