feat(cronet_http): decode cronet exceptions

[brianquinlan]

Fixes #1883

Decodes the Java CronetException into equivalent Dart classes (which are `ClientException subclasses).

Also snuck in the removal of an unnecessary server setup in testQuicHints.

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pkgs/cupertino_http/example/example.dart
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❗ Show Issues These packages are used outside lib/ but are not dev_dependencies: * flutter_test * http_client_conformance_tests * http_image_provider * integration_test * provider * test These packages are only used outside lib/ and should be downgraded to dev_dependencies: * flutter These packages may be unused, or you may be using assets from these packages: * dart_flutter_team_lints * yaml_edit Failed to update packages.

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pkgs/cronet_http/example/integration_test/client_profile_test.dart	💔 Not covered
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pkgs/cronet_http/example/integration_test/cronet_engine_test.dart	💔 Not covered
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cronet_http	Non-Breaking	1.8.0	1.9.0-wip	1.9.0-wip	✔️

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[goderbauer]

LGTM

[goderbauer]

nit: I noticed a tiny inconsistency in naming these exceptions. CallbackException above and QuicException below dropped the "Client" in their name, while the NetworkClientException retained it. Was that an intentional choice or should this also just be NetworkException instead?

[brianquinlan]

Nice catch! I removed the "Client" from all of the names. After thinking about it, it just feels like unnecessary repetition.