Add `responseHeaders` extension on `XMLHttpRequest` (#298) #33

Job	Run time
analyze_and_format; Dart 3.4.0; PKG: web; `dart format --output=none --set-exit-if-changed .`	20s
mono_repo self validate	13s
analyze_and_format; Dart dev; PKGS: web, web_generator; `dart analyze --fatal-infos .`	30s
analyze_and_format; Dart 3.4.0; PKG: web; `dart analyze --fatal-infos .`	26s
analyze_and_format; Dart dev; PKGS: web, web_generator; `dart format --output=none --set-exit-if-...	27s
unit_test; Dart 3.4.0; PKG: web; `dart test --test-randomize-ordering-seed=random -p chrome`	52s
unit_test; Dart 3.4.0; PKG: web; `dart test --test-randomize-ordering-seed=random -p chrome -c da...	31s
unit_test; Dart dev; PKGS: web, web_generator; `dart test --test-randomize-ordering-seed=random -...	57s
unit_test; Dart dev; PKGS: web, web_generator; `dart test --test-randomize-ordering-seed=random -...	41s
generate_and_analyze; Dart dev; PKG: web_generator; `dart analyze --fatal-infos .`	28s
generate_and_analyze; Dart dev; PKG: web_generator; `dart bin/update_bindings.dart`	50s
dart_fixes; Dart main; PKG: web; `dart fix --compare-to-golden test_fixes`	25s
	6m 40s

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