FR: support multiple repos within the entire VS Code workspace

[nickchomey]

Is your feature request related to a problem? Please describe.
It seems that we can only use vjj if the root of the workspace is a jj/git repo. I generally open my entire /home/username directory in VS Code so that I can easily navigate across different projects etc...

Describe the solution you'd like
VS Code's native git support, gitlens etc..., seem to scan the entire workspace for git repos and then let you manage them all from the UI. (I think they only detect the repos once a file from it is opened in the editor).

It would be great if VJJ could do something similar

A simpler, more immediate alternative would be to allow us to select the path that VJJ is monitoring.