[FEATURE] Add stylesheet loader to PWA-Kit SDK #4264

Job	Run time
lighthouse (18)	6m 47s
generated-windows (retail-react-app-test-project)	6m 48s
generated (retail-react-app-test-project)	4m 29s
generated-windows (retail-react-app-demo)	6m 53s
pwa-kit (16, 8)	3m 41s
generated (retail-react-app-demo)	4m 25s
generated-windows (express-minimal-test-project)	4m 42s
pwa-kit (16, 9)	3m 47s
generated (express-minimal-test-project)	3m 50s
generated-windows (typescript-minimal-test-project)	6m 32s
pwa-kit (18, 8)	3m 31s
generated (typescript-minimal-test-project)	3m 54s
pwa-kit (18, 9)	3m 30s
pwa-kit-windows (16, 8)	4m 18s
pwa-kit (18, 10)	3m 39s
pwa-kit-windows (16, 9)	5m 43s
pwa-kit (20, 8)	3m 24s
pwa-kit-windows (18, 8)	4m 15s
pwa-kit (20, 9)	3m 20s
pwa-kit-windows (18, 9)	4m 18s
pwa-kit (20, 10)	3m 18s
pwa-kit-windows (18, 10)	4m 7s
pwa-kit-windows (20, 8)	3m 31s
pwa-kit-windows (20, 9)	3m 57s
pwa-kit-windows (20, 10)	3m 36s
	1h 50m 15s

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