Allow to open an untitled editor with associated resource

[dmklementiev-zz]

I'd like to propose a feature for adding API to open an untitled editor with an associated file name/pattern. In my scenario I am trying to enable code snippets (via registerCompletionItemProvider(my pattern...)) for an untitled editor that contains json code. When I use openTextDocument({ language: 'json'}), VSCode creates Untitled-x (json) document as expected. However, in this case I cannot think of any file name pattern for my code complete snippets. It's just all .json files or none.

[vscodenpa]

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