List Billing entities

[ccremer]

Summary

Part 1 of #438

This PR introduces the feature to list billing entities under /billingentities, provided the user has access to view those.

Under the hood, this PR extends on #482 by implementing a generic ngrx/data-backed Kubernetes resource service.

Checklist

• [x] Categorize the PR by setting a good title and adding one of the labels: bug, enhancement, documentation, change, breaking, as they show up in the changelog
• [x] Update tests.
• [x] Link this PR to related issues.

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