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Update metrics exposed by Dropwizard to follow Prometheus recommended formats + JVM metrics at /metrics/prometheus (#1473)

- The /metrics/prometheus admin endpoint was wired to Dropwizard's JSON MetricsServlet, so it served Dropwizard's JSON format with dot-separated metric names instead of the Prometheus exposition format the path implies. Use the Jakarta Prometheus MetricsServlet so the endpoint serves the Prometheus text format, and add DefaultExports for JVM/process metrics (heap, GC, threads, CPU). A Prometheus server can now scrape this endpoint and Grafana can dashboard/alert on it.

- Added documentation for setting up the monitoring dashboard including sample prometheus configuration 

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Signed-off-by: Luca Foppiano <luca@foppiano.org>

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