AUTOSCALE-583: add karpenter-operator enhancement proposal

CVO-managed operator to deploy Karpenter on OpenShift, starting
with AWS behind the Karpenter DevPreviewNoUpgrade feature gate.

Covers payload images (karpenter-operator, aws-karpenter-provider-aws),
default EC2NodeClass from worker MachineSets, machine approver for
Karpenter-provisioned nodes, and the Hypershift convergence plan to
replace the existing CPO-embedded karpenter-operator with this
standalone binary.

Co-authored-by: Cursor <cursoragent@cursor.com>
Signed-off-by: Max Cao <macao@redhat.com>

Author: maxcao13