Create a flutter example application that uses multiple client implementations #848

Job	Run time
analyze_and_format; Dart dev; PKGS: pkgs/http, pkgs/http_client_conformance_tests; `dart analyze ...	45s
mono_repo self validate	20s
analyze_and_format; Dart 2.19.0; PKG: pkgs/http_client_conformance_tests; `dart analyze --fatal-i...	23s
analyze_and_format; Dart 3.0.0; PKG: pkgs/http; `dart analyze --fatal-infos`	20s
analyze_and_format; Dart dev; PKGS: pkgs/http, pkgs/http_client_conformance_tests; `dart format -...	29s
analyze_and_format; Flutter stable; PKG: pkgs/flutter_http_example; `dart format --output=none --...	1m 9s
analyze_and_format; Flutter stable; PKG: pkgs/flutter_http_example; `flutter analyze --fatal-infos`	50s
unit_test; Dart 3.0.0; PKG: pkgs/http; `dart test --platform chrome`	3m 10s
unit_test; Dart dev; PKG: pkgs/http; `dart test --platform chrome`	1m 24s
unit_test; Dart 3.0.0; PKG: pkgs/http; `dart test --platform vm`	46s
unit_test; Dart dev; PKG: pkgs/http; `dart run --define=no_default_http_client=true test/no_defau...	19s
unit_test; Dart 3.0.0; PKG: pkgs/http; `dart run --define=no_default_http_client=true test/no_def...	25s
unit_test; Dart dev; PKG: pkgs/http; `dart test --platform vm`	42s
unit_test; Flutter stable; PKG: pkgs/flutter_http_example; `flutter test --platform chrome`	1m 7s
unit_test; Flutter stable; PKG: pkgs/flutter_http_example; `flutter test --platform linux`	57s
unit_test; Flutter stable; PKG: pkgs/flutter_http_example; `flutter test`	1m 3s
	14m 9s

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