Boilerplate setup

[mowies]

Details

Set up the boilerplate code around the Keptn Argo REST client.

DoD

• API set up with a sample endpoint
• basic documentation written with code snippets for the different ConfigMaps that need to be set up in ArgoCD done in ArgoCD proxy configuration #3674
• dockerfile added and folder for it added to the various matrices in the pipelines so that the container images are built and pushed to GHCR
• unit tests already added to the pipeline with the correct folder name so that everything already gets tested when the code is there

[asamonik]

Looking into it

[github-actions]

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