[Feature] Restore from snapshot should be available from Stack Provider provider

[bvader]

Is your feature request related to a problem? Please describe.
As an SRE as part of our HA / DR strategy we need to be able to efficiently rebuild a cluster through IaC. Today that is not easy as the Terraform providers do not support snapshot and restore capabilities. What this means that is I have to support additional tooling to use the Elastic REST APIs instead of just the terraform provider which seems like a much better fit to build and restore a cluster from a snapshot.

Describe the resource you would like to have implemented.
As an SRE, I want to be able to deploy a new cluster using terraform and then restore the data & configuration from an existing snapshot that I have stored in a snapshot repository.

Additional context
This has been requested by more than 1 enterprise customer.