Allow more map interactions and refactor map value datastructures #15228

Job	Run time
Set up docker build 'dynamic' env variables	1s
Build and check documentation	3m 46s
End-to-end tests, chromium	13m 39s
Run the Django test suite	7m 28s
End-to-end tests, firefox	17m 49s
End-to-end tests, webkit	13m 27s
Run the Django test suite in reverse	5m 40s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 49s
docker_build (production) / Build image	2m 45s
Scan docker image	2m 32s
Simulate upgrading instances (3.0.1)	1m 18s
Check for unexepected OAS changes	5s
Validate OAS	14s
Generate SDKs from OAS	33s
Generate Postman collection from OAS	13s
Push Docker image	0s
update-docker-readme	0s
	1h 12m 19s

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