[oc-mirror] Add `--auth` option support in the `oc-mirror` binary

1. Proposed title of this feature request

• Current to authenticate registries for `oc-mirror` the `~/.docker/config.json` or `${XDG_RUNTIME_DIR}/containers/auth.json` should contain auth config for both release/catalog source images and your mirror registry.
• But the same is not needed for `podman` or `skopeo`  as both support `--auth` option where we can directly pass these files manually.

2. What is the nature and description of the request?

• Add flexibility in `oc-mirror` command by the `--auth` option to pass any file as a auth file.

3. Why does the customer need this? (List the business requirements here)

• The credentials are left on the sync server and must be manually deleted by the customer after each sync.
• Creating and removing files on the default path is difficult for the automation

4. List any affected packages or components.

`oc-mirror` binary

Extra:

• I don't find any documented information for the same as well
• I also find a simillar open bug for the same

https://github.com/openshift/oc-mirror/issues/537