Improve melos configuration #599

Job	Run time
Check formatting (dio)	10s
Check formatting (example)	15s
Check formatting (example_flutter_app)	13s
Check formatting (plugins/cookie_manager)	10s
Check formatting (plugins/http2_adapter)	10s
Check formatting (plugins/native_dio_adapter)	10s
Analyze Dart-only libraries (dio)	20s
Analyze Dart-only libraries (example)	25s
Analyze Dart-only libraries (plugins/cookie_manager)	23s
Analyze Dart-only libraries (plugins/http2_adapter)	15s
Analyze Flutter libraries (example_flutter_app)	38s
Analyze Flutter libraries (plugins/native_dio_adapter)	32s
Run unit tests with plugins	0s
Run unit tests with dio	0s
Run unit tests with Flutter plugins	0s
	3m 41s

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