[RFE] Index subcommand for the ocp wrapper

[rsevilla87]

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

The index subcommand is a useful feature that can be used to grab metrics from the past. I think having such feature as part of the ocp wrapper can be useful too. The difference with the regular kube-burner index subcommand would be that kube-burner ocp index should also collect the OCP metadata information and add it to all the collected metrics, similar to any other workload of the OCP wrapper.

Describe the solution you'd like

The following command

kube-burner ocp index -m metrics-file.yaml...

Before indexing metrics, should collect the required OCP metadata and append it to all the documents generated.
This is the current metadata appended to all documents indexed OCP wrapper's workload:

https://github.com/cloud-bulldozer/kube-burner/blob/6dd21f142b4f869b7153531e9faefde488616000/pkg/workloads/helpers.go#L152-L159