Add isStandaardAdres to the list endpoint filters for Digitale

[swrichards]

Thema / Theme

Klantinteracties API

Omschrijving / Description

It would be useful to be able to filter on isStandaardAdres, in additional to soortDigitaalAdres and the existing filters, when calling the Digitale Addressen list endpoint.

Toegevoegde waarde / Added value

In OIP we have the use-case "Does this Partij have a standard email and, if so, replace it" -- if we can do the filter server side, it saves us having to fetch more than we need and simplifies the existence check (return None if the results list is empty).

Aanvullende opmerkingen / Additional context

No response