Positron should offer to import existing VSCode preferences

[petetronic]

Early feedback from existing VSCode users have been surprised that Positron does not honor their existing VSCode preferences, such as light/dark theme, zoom level, etc. We should offer an option to import preferences if we detect an existing VSCode installation.

This should be possible both as an out of box experience, as well as a command in the command palette that can be accessed at a later time.

[juliasilge]

I looked at this a bit today and am making a few notes:

• cursor has this functionality but they don't have their code public
• This extension provides a way for folks to move their settings.json around to different computers by storing it in a gist

[bschwedler]

As a VS Code + VIM user I would find this super helpful!

[juliasilge]

This came up today during usability testing with @gadenbuie; he has a lot of user-specified keyboard shortcuts and would like a supported way to get those transferred over.

[juliasilge]

Feedback from private beta: https://github.com/posit-dev/positron-beta/discussions/15

We should look into also offering to import existing VS Code extensions, although we would need to find them on OpenVSX.

[juliasilge]

During usability testing with @machow today, he talked about wanting to import these settings as well.