Migrate Flutter functionality to Flutter extension

[DanTup]

Long-term, it'd be nice if people that have installed the Dart extension to do Dart (non-Flutter) dev didn't see Flutter functionality around the place. This issue is start building a list of these places for potential future migration.

• Commands
  • Flutter: New Project
  • Flutter: Run Flutter Doctor
  • Flutter: Get Packages
  • Flutter: Open in Android Studio
  • Flutter: Open in Xcode
  • ...
• Debugger + definitions
• Snippets
• Task definitions
• Settings
• Flutter entries in Capture Logs

[alestiago]

Thanks for working on this extension, I do agree with all the points defined here. I'm glad five years later this issue is still relevant 🙌🏻.

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From #4689 (comment):

Out of interest - why are you interested in this?

I'm working on Dart Frog's VS Code extension and some functionalities might require the user to already have the Dart extension installed. Since the framework is solely for Dart developers, it doesn't feel right to have them install the Dart extension and get all the Flutter related features with it (as you detailed in this issue and #4689 (comment) -- my reasons do align with yours 💙 🙌 ).