asdf-vm support for kubespy

[jfreeland]

This tool is great. Thank you for sharing.

I created https://github.com/jfreeland/asdf-kubespy and asdf-vm/asdf-plugins#352 to add this to asdf as I want to dynamically add this to my toolbox container which relies on asdf.

It's worth noting that the differences in release names and tarball structure made this a bit odd, https://github.com/jfreeland/asdf-kubespy/blob/main/bin/install#L25-L33 and https://github.com/jfreeland/asdf-kubespy/blob/main/bin/install#L41-L45.

If somebody doesn't beat me to it, some day I might borrow some of this code and create an awslbspy that uses the AWS API to monitor what's happening on an (ALB, NLB) when you're rolling a service, as well.

[jfreeland]

cc: @stack72