Add support for extension-less files on Mac

<!-- ⚠️⚠️ Do Not Delete This! feature_request_template ⚠️⚠️ --> <!-- Please read our Rules of Conduct: https://opensource.microsoft.com/codeofconduct/ --> <!-- Please search existing issues to avoid creating duplicates. --> <!-- Describe the feature you'd like. --> On the Mac, VS Code does not show up in the Open With menu for files without a file extension. You have to choose Other App and search for it. This makes it very cumbersome if you deal with a fair number of files that don't have a file extension. I figured out how to manually modify the Info.plist file to allow VS Code to show in the Open With menu on my machine, but it would be nice to have it be there automatically. In the Info.plist file, I added the following code inside the `CFBundleDocumentTypes` array. ``` <dict> <key>CFBundleTypeRole</key> <string>Viewer</string> <key>LSItemContentTypes</key> <array> <string>public.data</string> </array> </dict> ```