Add multi-workspace client

[Karthik-K-N]

This PR adds a mulit-workspace client, Which can be imported in any repositories to perform PowerVS VM search operations across multiple workspaces.

With introduction of cluster-api-provider-ibmcloud supporting mulit-workspace, There is need to change the cloud-provider-powervs to support this feature.

Main use case of multi-workspace client is to use it in cloud-provider-powervs.

[Note: If there is no need to have mulit-worksapce here, will move it privately to cloud-provider-powervs repo)

[ppc64le-cloud-bot]

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This pull-request has been approved by: Karthik-K-N
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[Karthik-K-N]

/cc @mkumatag @anshuman-agarwala

[Karthik-K-N]

This PR is ready for review.

Example reference on its usage in cloud-provider-powervs: openshift/cloud-provider-powervs@main...Karthik-K-N:cloud-provider-powervs:multi-workspace-support

[mkumatag]

@Karthik-K-N @kishen-v do we need this?

[Karthik-K-N]

@Karthik-K-N @kishen-v do we need this?

Yes, If it can be reviewed its good to have. But not urgent at the moment