permission matrix manipulation

[andreasfrisch]

🌟 Changes:

• Adds endpoint for any authenticated user to fetch the current RBAC rules
• Adds endpoint for cloudengineers (outside RBAC) to manipulate RBAC rules

🎶 Notes:
The new endpoint for getting rbac/permission-matrix sort of supercedes the existing one for rbac/get-assignable-permissions. We should at least keep the old one until the frontend is updated.

It feels weird to have something called Bootstrap that is used for more than just bootstrapping 🫣

❓ Question:
It seems okay that we have to update one role at a time when updating permissions.
However, it feels a little clunky in the frontend.
Should we simply allow PUTting all the permissions into the system in one fell swoop?

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