Existing aws_key_pair cannot be used

[brentnd]

While the option ssh_public_key works in many cases, sometimes it makes sense for the key to come from data.aws_key_pair, resource.aws_key_pair, or be hard-coded by name.

Can an option be added (key_name) that would allow users to have their own aws_key_pair outside of this module instead of using the internal resource "aws_key_pair" "minikube_keypair"?