FEAT: upload and open a file

[jonahrb]

Ability to upload a file from client to server and open it

[jonahrb]

@RobPasMue definitely going to need your input on design choices here, and how/if I can better test this. We don't exactly have a test_modeler.py so I went ahead and put this in test_design.py since it seemed most fitting.

[RobPasMue]

@RobPasMue definitely going to need your input on design choices here, and how/if I can better test this. We don't exactly have a test_modeler.py so I went ahead and put this in test_design.py since it seemed most fitting.

Let's talk offline about this and summarize here on GH our decision

[jonahrb]

As of now, this feature should be done and should pass when the new unstable images get published. We need to figure out how we want to test this though. For now I can just create create something, download the file, then upload the file.

[RobPasMue]

Great job @jonahrb