fix(vscode): debug session persists on premature application exit

[alestiago]

Description

Currently, the VS Code extension is assuming developer's Dart Frog code is legitimate. However, sometimes the codebase might have errors that will cause the daemon to exit the application without the developer wanting so. For example, importing dart:html (as show in in demo video). In such cases, the debug session requires to be detached.

Steps To Reproduce

1. Install dependencies (from: extensions/vscode):

npm i 

2. Start the extension development host (F5):
3. Open a Dart Frog project route and include an import statement that imports dart:html:

import 'dart:html';
import 'package:dart_frog/dart_frog.dart';

Response onRequest(RequestContext context) {
  return Response(body: 'Welcome to Dart Frog!');
}

4. Debug the server
5. See error

Expected Behavior

• To detach the application on premature application exit
• To inform the user about the error that causes the premature application exit

Demonstration

CleanShot.2023-09-14.at.07.49.38.mp4