Cluster Autoscaler settings per worker group not supported

[aaronfern]

How to categorize this issue?

/area auto-scaling
/kind enhancement
/platform equinix-metal

What would you like to be added:
cluster-autoscaler:v1.28.0 now supports configuring certain flags per worker group. This helps in more fine-grained control on how cluster-autoscaler works on a particular cluster
These values are present in the worker spec in worker.spec.pools.clusterAutoscaler. They need to be read and added to the corresponding machineDeployment as annotations for cluster-autoscaler to pick them up

Prerequisite
This change needs at least gardener/gardener v1.90.0 to be vendored before this feature can be used

Why is this needed:
This change is needed to be able to specify some cluster-autoscaler options per worker pool
Refer gardener/autoscaler#240 for the issue tracking this story