Support for debugging on Firefox

[NatoBoram]

Use case

Sometimes, there's JavaScript errors occurring in Firefox that would strongly benefit from having a debugger. At the moment, the only way to use a debugger are gatekeeped to Chromium.

• flutter run -d chrome
• flutter run -d edge
• flutter run -d web-server and install Dart Debug Extension Firefox support for Dart Debug Extension? dart-lang/webdev#1224

Proposal

Support Firefox as a web device and enable debugging on Firefox.

• flutter run -d firefox

[jonahwilliams]

Duplicate of #55324

[github-actions]

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