feat(@schematics/angular): add a '.prettierrc' file to generated work… #2921

Job	Run time
list	24s
workflow (devkit-core-tests-rerun)	1m 25s
workflow (build-cli)	1m 54s
workflow (modules-builder-tests)	1m 55s
workflow (build-unit-tests)	2m 33s
workflow (devkit-core-tests)	1m 21s
	9m 32s

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