feat(logging): cloudwatch logging plugin to implement logging plugin interface #853

Job	Run time
test / test-dart-vm (3.0.1)	2m 1s
test / test-dart-vm (stable)	1m 59s
dart2js_test / test-dart-2js (3.0.1, chrome)	6m 3s
ddc_test / test-dart-ddc (3.0.1, chrome)	2m 19s
native_test / test-dart-native (macos-latest)	2m 26s
dart2js_test / test-dart-2js (3.0.1, firefox)	5m 58s
ddc_test / test-dart-ddc (3.0.1, firefox)	2m 29s
native_test / test-dart-native (windows-latest)	3m 20s
dart2js_test / test-dart-2js (stable, chrome)	5m 20s
ddc_test / test-dart-ddc (stable, chrome)	2m 10s
ddc_test / test-dart-ddc (stable, firefox)	2m 28s
dart2js_test / test-dart-2js (stable, firefox)	5m 32s
	42m 5s

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