Expose rdzv-conf in torch-run launcher in nemo-run

[snowmanwwg]

We should expose rdzv-conf in the torch-run launcher similar to how we expose rdzv_backend, rdzv_port and rdzv_id.
This feature request is based on the ticket:
https://requests-navigator.atlassian.net/jira/servicedesk/projects/NFS/queues/custom/237/NFS-402

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