Rework exceptions and stacktraces #603

Job	Run time
Check formatting (dio)	14s
Check formatting (example)	9s
Check formatting (example_flutter_app)	13s
Check formatting (plugins/cookie_manager)	10s
Check formatting (plugins/http2_adapter)	11s
Check formatting (plugins/native_dio_adapter)	10s
Analyze Flutter libraries (example_flutter_app)	37s
Analyze Flutter libraries (plugins/native_dio_adapter)	35s
Analyze Dart-only libraries (dio)	19s
Analyze Dart-only libraries (example)	22s
Analyze Dart-only libraries (plugins/cookie_manager)	24s
Analyze Dart-only libraries (plugins/http2_adapter)	17s
Run unit tests with Flutter plugins	0s
Run unit tests with dio	0s
Run unit tests with plugins	0s
	3m 41s

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