feat: introduce Maestro and Hypershift Go libraries to Backend

[miguelsorianod]

This PR introduces the following to backend:

• Adds the Maestro library
• Introduces the Maestro client and related constructors
• Adds the Hypershift library and has a placeholder referencing it to keep it in go.mod

The libraries and the Maestro client will be used in follow-up PRs that will interact with Maestro and reference Hypershift related custom resources.

[openshift-ci]

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This pull-request has been approved by: miguelsorianod
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