feat(instance): add VNC session management commands

[uzaxirr]

fixes: #537

[uzaxirr]

[giornetta]

This is an output I'm receiving for civo instance vnc status my-instance:

Instance ID : {instance_uuid}
Instance Hostname : my-instance
           Status :
              URI : https://vnc.lon1.civo.com/...
           Expiry : 2025-06-11T11:42:12Z

What's the point of the empty Status field?

[uzaxirr]

This is an output I'm receiving for civo instance vnc status my-instance:

Instance ID : {instance_uuid}
Instance Hostname : my-instance
           Status :
              URI : https://vnc.lon1.civo.com/...
           Expiry : 2025-06-11T11:42:12Z

What's the point of the empty Status field?

As of now we are reciving its reponse as empty from the API, i've mapped status to vnc.Result field

[giornetta]

As of now we are reciving its reponse as empty from the API,

There's no such field in the API response. The only field returned by the API are uri and expiration.

[giornetta]

LGTM