[Feature Request] Levant support for templating Nomad CSI volumes

[mgeggie]

Description
We're heavy users of Levant for templating our Nomad jobs on our Nomad clusters. We have recently implemented CSI volume management on our Nomad clusters and found that managing our CSI volumes via nomad volume create is cumbersome without templating, which seems like an ideal extension for Levant. Templating our volume definitions would save us from having to manage dozens of un-templated volume definition files for the various deployments we have for our Nomad jobs.

Given the slowing of development of Levant in recent times, we're curious if this is a feature that the Hashicorp team would consider implementing to help support the Nomad and Levant communities?

Nomad version: Nomad v1.3.5
Levant version: Levant v0.3.2
Consul version: Consul v1.12.2