Add levant

[pdmthorsrud]

As we discussed on friday, levant might be very useful

https://github.com/hashicorp/levant

[Neha-Sinha2305]

While working on this PR, I noticed that the terraform apply did not fail, although the mc(minio-client) nomad batch job failed to get deployed successfully.

module.minio.nomad_job.nomad-job-mc: Creating...
module.minio.nomad_job.nomad-job-mc: Creation complete after 0s [id=mc]

I went through nomad's github repo to find out if they have any such feature so as we can wait for the job to get successfully deployed and i saw that they have an issue which is in Open state: Flag to wait till deployment actually succeeded

Alternatively, levant could be useful here to make such advanced checks:
https://github.com/hashicorp/levant/blob/master/README.md

Advanced Job Status Checking: Particularly for system and batch jobs, Levant ensures the job, evaluations and allocations all reach the desired state providing feedback at every stage.