feat: Throw error when trying to define a derived value during resolution.

[iwoplaza]

Motivation

Allowing this pattern would introduce a lot of unnecessary complexity to how we handle slot bindings. It could theoretically be possible, but lets restrict it for now for our own sanity. If there's a valid use-case for this, and a sane behavior, we can re-enable it.

Possible implementation

We can check if getResolutionCtx() returns a defined value, and throw a descriptive error if it does.