refactor: access policy enum

[Schwehn42]

Description

Problem: Since the very beginning, AccessPolicy was an enum. This might look nice to use but actually causes some trouble, especially when trying to cast json data from an endpoint. Sure you can use typeof keyof AccessPolicy but that has other disadvantages.

So, this PR simply replaces the enum in favour of an union type.

Further reading: https://dev.to/ivanzm123/dont-use-enums-in-typescript-they-are-very-dangerous-57bh

Changelog

• change AccessPolicy from enum to union type
• adjust code that's impacted by the change

Checklist

• I have performed a self-review of my own code

[mateo-ivc]

lgtm

[github-actions]

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