Allow me to run a step, not a whole workflow

[josephjclark]

At the moment we have a Run Workflow option, which can be triggered from many places and is great.

When I have a file open, I want to be able to that step standalone. Probably just from the command palette - so we have Run Workflow and Run This Step or something.

In technical terms, we can either run the workflow and pass --only to just run this step file, or we can load the adaptor and credential etc from the workflow and run the expression standalone openfn job.js -a http -s input.json