feat(logging): add a new logging category and plugin interface #174

Job	Run time
test / test-dart-vm (3.0.1)	1m 42s
test / test-dart-vm (stable)	1m 50s
native_test / test-dart-native (macos-latest)	1m 58s
ddc_test / test-dart-ddc (3.0.1, chrome)	2m 27s
native_test / test-dart-native (windows-latest)	2m 36s
ddc_test / test-dart-ddc (3.0.1, firefox)	2m 6s
ddc_test / test-dart-ddc (stable, chrome)	1m 54s
ddc_test / test-dart-ddc (stable, firefox)	2m 7s
dart2js_test / test-dart-2js (3.0.1, chrome)	2m 33s
dart2js_test / test-dart-2js (3.0.1, firefox)	2m 19s
dart2js_test / test-dart-2js (stable, chrome)	2m 15s
dart2js_test / test-dart-2js (stable, firefox)	2m 17s
	26m 4s

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