Expose metrics

As part of adding [Observability](https://github.com/Kuadrant/authorino/issues/162) to Authorino, some metrics at the operator level need to be exposed to measure the states of the instances deployed via the operator.

The proposal is that initially the operator can expose two metrics

* authorino_instance_boostrap_time(instance_namespace="",instance_name="") - Measures the time an instance of Authorino takes to created
* authorino_instances_total(status="") - Counts the number of Authorino instances managed by the operator

The issue names no files, tests, or entry points. Start by locating the operator reconciliation path and any existing metrics instrumentation, then define and expose the two proposed instance metrics with namespace, name, and status labels; done means both metrics report the requested bootstrap timing and instance counts.

Written by the indexing model from the issue text.