RTKQ feature proposal: Add transformError property to the endpoints

[donatoaguirre24]

It would be great to have a transformResponse equivalent for errors. The transformError property would allow manipulation of the error returned by a query or mutation before it hits the cache.

This new property would help to decouple error parsing logic from the view. The service will encapsulate the logic, and the views will act just as a presenter of the data/error the query or mutation returns.

[dreyks]

I'd love to have this feature! any opinions on this from the team? I can try to come up with a PR if this is something we want to have

[markerikson]

Yeah, if someone would like to take a stab at this and file a PR, we can look at it.

[phryneas]

But note that this will probably be touching a lot of types, so it might get very complicated.

[dreyks]

created #1841 as a first pass. let me know if I'm going the correct direction

[markerikson]

Merged this - it'll be in the #2401 PR preview builds momentarily, and I'm hoping to put out 1.9.0-alpha.0 in a bit