feature request: distinct VScode mode to ignore amVim commands

[asdqdsa]

Basically asking for to simulate enabling/disabling extension without reloading the editor. Likeinsert, visualor normal, would've been neat if you could switch to vscode mode to use vanilla vscode keybindings(and to ignore all the vim commands) and then switch back to amVim.

[alisonatwork]

Thanks for this idea. I think it is the same as #329.