metrics: in quarkus mode, use microprofile metrics in place of the prometheus agent

[lburgazzoli]

quarkus provides a metrics extension based on the MicroProfile/SmallRye that can be used to generate metrics for prometheus, so in quarkus mode, camel-k should opt to use it instead of the prometheus agent.

Some refs:

• https://quarkus.io/guides/microprofile-metrics
• https://github.com/apache/camel-quarkus/tree/master/extensions/microprofile-metrics

We need to be sure we do expose the same metrics in both the scenarios.

[lburgazzoli]

/cc @astefanutti