[Feature] - Allow attaching VPC2 to instance upon creation

[optik-aper]

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Similar to the regular VPC, it would make sense to allow passing in VPC2 IDs to the create command for instances. This would avoid needing to attach in a second command.

Describe the solution you'd like Add a attach-vpc2 flag to instance create which would accept a number of VPC2 IDs

Describe alternatives you've considered Alternatives would be creating and then attaching the VPC2 to an instance