feat(@angular/build): enable chunk optimization by default with heuri… #1880

Job	Run time
list	28s
workflow (build-unit-tests)	25s
workflow (modules-builder-tests)	25s
workflow (build-cli)	25s
workflow (devkit-core-tests)	22s
workflow (devkit-core-tests-rerun)	23s
	2m 28s

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