Problem

The LiveShare extension is currently * activated. I believe the main reason for this is so they can contribute a Live Share button in the status bar

This is currently only possible to do in code

Proposal

Add a new contribution point that lets extensions contribute a static item (potentially with a when clause) to the status bar. Clicking on this item should trigger a command, which can then activate the full extension

/cc @isidorn @bamurtaugh @jramsay @joyceerhl