allow storage option in configmap

[kranurag7]

What this PR does / why we need it:

while running metrics-server with nanny enabled. I see the following logs:
metrics-server-nanny I0524 03:18:42.689332 1 pod_nanny.go:101] storage: MISSING, extra_storage: 0Gi and I wanted to avoid this.

I chose 10Mi default value but that can be changed as well. Please feel free to suggest a new value.

Ref: https://github.com/kubernetes/autoscaler/blob/cf606a1400d6e421d32349e25115b508382111ff/addon-resizer/main.go#L145-L167

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[ricardoapl]

Is this supported in nannyconfig/v1alpha1?

https://pkg.go.dev/k8s.io/autoscaler/addon-resizer/nanny/apis/nannyconfig#pkg-types

[kranurag7]

Yes, that is missing. I think that means we shouldn't parse the following:
Base: resource.MustParse(*baseStorage),

Ref: https://github.com/kubernetes/autoscaler/blob/cf606a1400d6e421d32349e25115b508382111ff/addon-resizer/main.go#L163C51-L164C1

[ricardoapl]

I'm not sure I understand your reply. I think you'll have to conditionally set command-line arguments for storage and extra-storage, because those don't seem to be supported by the config file. Might want to confirm with sig-autoscaling, as they are the owners for addon-resizer.