feat: flexible endpoint context

[SychO9]

Isolating the checking of the current CRUD context into the context object can be helpful in our case since we implement our own separate Create endpoint class that does not extend the default one.

Understandable if not fit here.

[tobyzerner]

How does the method in Context get overridden though?

[SychO9]

We use a custom Context class that extends the base one, where we add additional helpful methods such as getActor