feat: add power state to VMSS virtual machines

[pdecat]

This PR adds power state to the azure_compute_virtual_machine_scale_set_vm table.

Largely inspired from the code of the azure_compute_virtual_machine table.

[misraved]

@pdecat thank you so much for the PR 👍 !!

Could you please add a simple example query showing the value of power_state column?

[pdecat]

Added a sample query, here's the result when all instances are in running state:

> select
  vm.name,
  vm.power_state
from
  azure_compute_virtual_machine_scale_set_vm as vm;
+------------------------------+-------------+
| name                         | power_state |
+------------------------------+-------------+
| aks-frontend-53375067-vmss_0 | running     |
| aks-tooling-45209782-vmss_0  | running     |
| aks-frontend-53375067-vmss_2 | running     |
| aks-default-31213497-vmss_0  | running     |
| aks-service-39716677-vmss_2  | running     |
| aks-service-39716677-vmss_1  | running     |
| aks-frontend-53375067-vmss_1 | running     |
| aks-service-39716677-vmss_3  | running     |
| aks-frontend-53375067-vmss_3 | running     |
| aks-service-39716677-vmss_0  | running     |
+------------------------------+-------------+