Support to inherit object store credentials from IAM

[takeda]

I noticed the chart to deploy cluster has an option for Azure inheritFromAzureAD allowing not to specify credentials manually (they are a bit problematic if the policy is to rotate them frequently).

I see that similar functionality is already available in AWS:

https://github.com/cloudnative-pg/cloudnative-pg/blob/bd86755e192a5682ee73d0a882eafcb8dee9e5f6/api/v1/cluster_types.go#L2398

Couldn't confirm that for GCP.

Is it possible to add this? I just learned about CloudNative PG and thinking to advocate for using it, but this might be a bit of a roadblock as the policy is to rotate any credentials at least once a month.