Feature: ReturnCode as PerfValue for grafana dashboards

[moreamazingnick]

Is your feature request related to a problem? Please describe.

It would be nice to have the returncode as a perfvalue so it gets written to a timeseries db

Describe the solution you'd like

Implement into businessporcess-module

Describe alternatives you've considered

Implement into own module and inherit businessprocess check command

Additional context

If you want I can prepare a merge request.

Thanks and
Best Regards
Nicolas