Adds a `-type` flag to the `volume init` command that generates an example
volume specification with only those fields relevant to dynamic host
volumes. This changeset also moves the string literals into uses of `go:embed`
Ref: https://github.com/hashicorp/nomad/pull/24479
Add new `access_mode`/`attachment_mode` fields. Make it more clear which set
of fields belong to create vs register. Update the example spec that's
generated by `volume init`.
Create a convenience command for generating example CSI volume specifications,
similar to the existing `nomad job init` or `nomad quota init` commands.
