`ModelValueCache` rework (#2675) #6175

Job	Run time
build-mdbook	6s
compiler-warnings	4m 2s
format-check	6m 23s
scaladoc-check	4m 1s
integration-tests (ubuntu-latest, oopsla19)	19m 39s
integration-tests (ubuntu-latest, arrays)	11m 7s
integration-tests (macos-latest, oopsla19)	32m 52s
unit-tests (ubuntu-latest)	11m 6s
unit-tests (macos-latest)	12m 4s
docker-tests	29m 30s
	2h 10m 50s

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