Allow adding extra rules to the Role / ClusterRole template of the Cluster AutoScaler Helm chart

[Archisman-Mridha]

Which component are you using?:

/area cluster-autoscaler

Is your feature request designed to solve a problem? If so describe the problem this feature should solve.:

I am using ClusterAPI + Cluster AutoScaler, and would like to use the opt-in support for scaling from zero provided by the AWS Infrastructure Provider (can be any other Infrastructure Provider as well, like : Hetzner / GCP / Azure).

This requires me to add the Infrastructure Machine template types to the Role / ClusterRole associated with the Cluster AutoScaler deployment (refer here).

The Cluster AutoScaler Helm chart doesn't allow me to add extra rules to the Role / ClusterRole.

Describe the solution you'd like.:

I would like the Helm chart to have some parameter, using which I can add whatever additional rules to the Role / ClusterRole

Describe any alternative solutions you've considered.:

If you don't agree with the above solution, then we can have specific rules for each Infrastructure Provider hardcoded in the Role / ClusterRole template. I can bring the extra rules for an Infrastructure Provider into effect using some parameter.

Additional context.:

NA