Add util for uploading to pathmind webapp for training

[slinlee]

This will get the users's access-token and upload the pathmind simulation via CLI

It will:

• run basic validation (if we have any)
• generate the yaml #3
• zip the files
• upload via api
• open the returned experiment url in the browser

[maxpumperla]

@slinlee can you share

• what exact format the upload currently expects (what's in the zip file etc.)?
• how does the upload API work?
• how does a regular user get the required tokens to use said upload API?
• Do we already know what the experiment URL will be before the upload? If so, what is it?

maybe something we can discuss in tonight's RL sync?!