Add new metrics and new API to count events to console backend

Description

As RH PM/engineer, we want to understand the usage of the (dev) console, for that, we want to add new Prometheus metrics (how many users have a cluster, etc.) and collect them later (as telemetry data) via cluster-monitoring-operator.

Acceptance Criteria

1. Add new prometheus metrics based on the Epic ODC-7171 and the created metrics documentation https://docs.google.com/document/d/1PqbKv_-q2PW8mK3lwGEjpLwO5jdf9TojOchnjUY9YMU/edit#
2. Add a new endpoint to get events from the frontend so that we can also track page navigations via history.push

Additional Details: