feat(core): add AmplifyOutputs types based on the Amplify Gen 2 client config schema #2443

Job	Run time
test / test-flutter-vm (stable, any)	3m 56s
test / test-flutter-vm (stable, 3.19.0)	3m 31s
e2e_ios_test / e2e-test-ios (stable)	11m 29s
e2e_windows_test / e2e-test-windows (stable)	10m 6s
e2e_web_test / e2e-test-web (stable)	7m 37s
e2e_android_test / e2e-test-android (24, stable)	12m 42s
e2e_android_test / e2e-test-android (33, stable)	15m 9s
e2e_linux_test / e2e-test-linux (stable)	6m 51s
	1h 11m 21s

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