Investigate "file grouping/folding" in file explorer

[ivanbuhov]

Research if it is possible to display related files as a group in VSCode file explorer. In a typical NS app it is common to have files with same names and different extension:

• markup.xml
• markup.ts
• markup-viewmodel.ts
• markup.css

It would be convenient if these pages could be displayed as one logical entry in the file explorer (kinda like a "code behind" files).

Consider adding an "Add new {N} view/page" command which creates a brand new "group" of related files with some boilerplate content.

[ivanovit]

This is still not supported by VS Code. Adding the discussion for reference: microsoft/vscode#6328