Add features: start, stop, save VMs

[sheepla]

Allows to perform operations such as start, stop or save VMs

[sheepla]

I've found that it can be done using PowerShell, but I just don't know how to do that in Go. 🤔

It should be able to change the VM state by invoking the RequestStateChange method of the Msvm_ComputerSystem class that represents the VM.

Msvm_ComputerSystem.RequestStateChange

# PowerShell (Administrator)
> Get-VM -Name debian

Name   State CPUUsage(%) MemoryAssigned(M) Uptime   Status     Version
----   ----- ----------- ----------------- ------   ------     -------
Debian Off   0           0                 00:00:00 正常稼働中 10.0

> $enable = 2
> $disable = 3
> Get-CimInstance -Namespace root/virtualization/v2 -ClassName Msvm_ComputerSystem | 
    ? ElementName -eq "Debian" | 
    Invoke-CimMethod -MethodName "RequestStateChange" -Arguments @{RequestedState = 2}

Job                                                                    ReturnValue PSComputerName
---                                                                    ----------- --------------
Msvm_ConcreteJob (InstanceID = "6E69C4C8-0A89-4857-8E85-C9CC77A78BD1")        4096

> Get-VM -Name Debian

Name   State   CPUUsage(%) MemoryAssigned(M) Uptime           Status     Version
----   -----   ----------- ----------------- ------           ------     -------
Debian Running 0           1024              00:00:50.8140000 正常稼働中 10.0