Implement a remote StsAccountProvisioner

[paullatzelsperger]

Feature Request

Implement an StsAccountProvisioner, that uses the STS Accounts API of a standalone deployed STS Service.

Currently, we have an StsAccountProvisioner that works directly on the embedded StsAccountStore, which is useful when the STS
is embedded directly in IH.

Which Areas Would Be Affected?

e.g., DPF, CI, build, transfer, etc.

Why Is the Feature Desired?

To enable automatic STS account provisioning in cases where the STS is deployed as standalone service

Solution Proposal

Implement a separate extension module with an StsAccountProvisioner implementation that uses the STS Accounts API