[#239] Include PartijIdentificatoren on Partij serializer #1150

Job	Run time
Documentation build	24s
Determine changed files	4s
create values which can be passed through a reusable workflow	1s
open-api-ci / Documentation build	38s
open-api-ci / Check requirements files	3s
open-api-ci / Docker image build	1m 39s
Tests (PG 13)	4m 12s
Tests (PG 14)	5m 2s
Tests (PG 15)	4m 10s
Tests (PG 16)	4m 55s
open-api-ci / Scan docker image	1m 29s
open-api-publish / Push Docker image	0s
	22m 37s

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