add support for nested virtualization

[abiosoft]

Which issue(s) this PR fixes:

This PR adds support for nested virtualization, added in macOS 15 for m3 devices.

Additional documentation

Sample usage

platformConfig, err := vz.NewGenericPlatformConfiguration(vz.WithGenericMachineIdentifier(machineIdentifier))
if err != nil {
	return err
}

// nested virt
platformConfig.SetNestedVirtualizationEnabled(true)

[AkihiroSuda]

CI not running?

[abiosoft]

CI not running?

I have no idea why.

[AkihiroSuda]

Format check is failing

[abiosoft]

Format check is failing

I've figured how to resolve it.
Can you kindly enable the workflow again? @AkihiroSuda.

[abiosoft]

FYI I have been having same issue of builds terminating abruptly (on other projects) with GIthub actions for some days now.

[AkihiroSuda]

Thanks, CI is failing, but let's merge this