Interactively define an operation

[brollb]

It would be useful to have an interactive editor which explicitly allows the user to define an operation using interactive compute.

This would probably be a good way to create operations from scratch to start with. It is worth noting that this would be producing multiple outputs: the artifacts themselves and the operation definition.

[brollb]

As far as the UI, perhaps the most direct approach would be to simply add tabs to the current operation editor for output and any generated figures. However, we would still need to have a way to:

• specify inputs
• save generated outputs
• save the operation definition