Support moving the explorer with drag and drop

[sbatten]

Part of #143264

[abhijit-chikane]

So this will also enable us to move extensions and debug menu or just the explorer? @sbatten

[sbatten]

This item is focused on explorer only. The parent item will remain open after this is closed.

[abhijit-chikane]

Thank you for the update @sbatten
But it would be nice if we can move each panel to sidebar

[lramos15]

Closing as the explorer is moveable as of #173619