Extend the API to add custom file opener

[iamolivinius]

I wanted to port the pdf-view extension for atom to vscode.

One thing that I came across that I don't know how to do it in vscode is atom's ability to add custom file openers: https://atom.io/docs/api/v1.8.0/Workspace#instance-addOpener

I'm pretty new to vscode so correct me if I'm wrong but without such API one would have to take a detour through the command palette to open a PDF file with pdfjs and the intuitive way via "Open File..." and (double) clicking on the file tree wouldn't work.

[kieferrm]

Yes, you would have to go through the command pallet.

[jrieken]

Also, you can now add commands to the context menu like the markdown extension does

[jrieken]

/duplicate of #29194

[vscodebot]

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