Idea: Workspaces and automatic file creation as first steps towards note taking support

So workspaces would be like what you find in VSCode and Xcode.

And automatic file creation means that searching for a topic in the workspace that doesn’t exist can automatically create a .tm file for that topic.

P.S. Why not use the terminology of VSCode and Xcode whenever possible instead of emacs in the TeXmacs UI (e.g., “workspace”, etc.)?