Name change request

[sdodsley]

Given the Prometheus format has been adopted as the OpenMetrics standard, would it not make more sense to rename this soltuon the OpenStack OpenMetrics Exporter.

By calling this Prometheus you may be limiting the adoption of the exporter.

OpenMetrics is a more generic term and carries a larger gravitas with the observability community.

It will also ease the way into creating Opentelemetry receivers for OpenStack if that is in the plan...