Add Quadlet configuration and RPM packaging

[seantronsen]

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Description

First draft at the idea of creating an RPM quadlet for metadata-service. It's still in the draft stage with TODO markers placed anywhere further design decisions were required.

Should also await the fix for #33 as it would introduce config file changes.

Fixes #31

Important

Must await:

• Feature/dry quadlet rpms github-actions#14
• Update release with new fabrica-based services; remove old services release#50

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

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