[Feature] Create On Prem Agent

[ravager-dk]

So this one is a bit complex I know to implement as there are several factors outside the Terraform provider that needs changes.
In essence I would like the ability to do the following workflow:

1. Download the NetScaler Console Service on-prem agent (This provider)
2. Import the agent into hypervisor (Hypervisor provider)
3. Preconfigure IP addresses of the agent on the Hypervisor through xenstore data, vmware parameters or other (Hypervisor provider)
4. Get agent registration "Service URL" and the "Activation Code" for Netscaler Console Service (This provider)
5. Register agent to NetScaler Console Service (This provider or a new Agent provider)
6. Assign agent to correct datacenter etc. (This provider)

"3." and "5." will surely require changes to the Agent which is out of scope for this provider.