Changes to POST /api/v1/behandling/:behandlingId/vilkårsvurdering/splitt

added the new required request property vilkårsvurderingId

removed the request property splittFra

added the new required request property splittFra

the request's body type changed from string to object, and format from date to no format

removed the media type text/plain from the request body

added the media type application/json to the request body

endpoint added