Added advice for help --> `'For more, run help(plotly.graph_objs.Obj)'`.

This was a bit more convoluted than we thought. Since you're trying to
reference help on an object that hasn't been defined yet! I had to make
a new map: `KEY_TO_CLASS_NAME` for this purpose. Kind of an ugly
solution. For now it works.

This ONLY prints when a key is tagged with `'type': 'object'` in INFO.