Request to add a feature to mirror images with the following scheme

`source_host/source_repo/artifact` -> `mirror_host/mirror_repo/source_host/source_repo/artifact`

This would make itms/idms creation much easier as we can only need to specify the one item per source host.

e.g.:

```
apiVersion: config.openshift.io/v1
kind: ImageDigestMirrorSet
metadata:
  name: redhat-operators
spec:
  imageDigestMirrors:
  - mirrors:
    - {{ mirror_host }}/{{ mirror_repo}}/registry.redhat.io
    source: registry.redhat.io
    mirrorSourcePolicy: NeverContactSource
```

The current implemented mirroring scheme is as follows:

• `source_host/source_repo/artifact` -> `mirror_host/mirror_repo/source_repo/artifact`

So all in all, we are asking for the `source_host` to be added to the mirroring scheme.