Allow debugger contributions to specify filenames as well as languages to be default debugger

[DanTup]

Currently a debugger can only declare languages that it's default debugger for, but in other places where VS Code allows specifying languages, we can use filename patterns too.

Sometimes users switch to a file that is not in the language they're working on, but an additional file (for example in Dart we have pubspec.yaml and in NodeJS there's package.json). It'd be nice if you switched to package.json to change a dependency and then hit F5, it could invoke the Node JS debugger (and for pubspec.yaml, the Dart one), skipping the prompt.

"contributes": {
  "debuggers": [
    {
      "languages": [
        "dart",
        // Support something like DocumentFilter here?
        // { language: 'json', scheme: 'untitled', pattern: '**/package.json' }
        { pattern: '**/pubspec.yaml' }
      ],

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[weinand]

As pointed out by @DanTup this feature request is most likely a prereq for #146338