Add ability to open files with the OS's default application

[astier]

I want to reopen the issue #75188. It is about adding the ability to open files with the OS's default applications from within vscode. For example pdf-files. The program xdg-open could be used to determine the default applications on linux.

Here is what the original author @nabeelomer wrote:

A context menu option can be added to the file browser that allows files to be opened in the default application for that file type. For example if the file is a PDF document, opening the context menu and click "Open with desktop" will open the file with the default PDF reader.

This can be accomplished with the openItem() method from Electron's shell module.

I am aware that this particular feature has been suggested before in #50383 and #45989 but my suggestion is not the same as that.

I am using vscode 1.42.1

[isidorn]

This is a fair feature request, however we do not have it on our immediate plan. Thus assigning to backlog and we might add this in the future. Though I still believe this should be done via an extension. Thanks