Add version to the internal telemetry metrics (#4140)
Add version to the internal telemetry metrics (#4140)

Added a version tag to the collector's own telemetry metrics because today when looking at those metrics there is no way to know the collector's version, this can also help to know what collector versions are running out there.
I based the "flag" to control this on [PR 3816](https://github.com/open-telemetry/opentelemetry-collector/pull/3816)
open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector