Integrate nargo info output as vscode code lens

[kobyhallx]

No description provided.

[TomAFrench]

I've done some thinking on this and am a little concerned that this is going to be a little too heavy to display automatically inline with the code. Circuits would need to be completely recompiled on each save which for larger circuits results in a delay of multiple seconds before we can display any information.

I think what we can do in the meantime is add a button which will open a terminal and run nargo info similar to the "compile" and "execute" lenses.