add allowVolumeExpansion to storageclass

[yzapf]

Is this a bug fix or adding new feature?
This is a new feature.

What is this PR about? / Why do we need it?
relates to #1591

This will add the possibility to set allowVolumeExpansion in the created storage class(es).

What testing is done?
Tested this via helm template. The template got created and included the expected storage class with allowVolumeExpansion: true.

[linux-foundation-easycla]

• ✅login: yzapf / (5154e93)

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