Transcribe workflow-service to hmi-server - Part 1

[mwdchang]

Summary

Workflow updates and syncs can be quirky because we update the workflow object in a wholesale manner. This PR changes the paradigm by telling the server what we want to do to the workflow, rather than doing something to the workflow and asking the server to try to save it.

To not make the PR several thousands lines long, these are left in-place for now and will be done later

• Cloning a branch in the workflow, this part is very complicated
• State updates

Added

• POST /workflow/:id/select-output/:node-id/:output-id
• POST /workflow/:id/append-output/:node-id
• POST /workflow/:id/node
• DELETE /workflow/:id/node/:node-id
• POST /workflow/:id/edge
• DELETE /workflow/:id/edge/:edge-id

There are analogous to the functions in client service/workflow.ts

Testing

Normal workflow operations should work as before