[FEATURE] Automatically infer edges from previous node inputs

[dbwiddis]

Is your feature request related to a problem?

Defining an input from a previous step essentially establishes the source/destination edge relationship in the graph. It is redundant to both declare that step 2 depends on output "foo" from step 1, and simultaneously require the user to create an edge from step 1 to step 2 (or fail validation).

What solution would you like?

When parsing a workflow, create a list of "inferred edges" based on previous node inputs. If they do not duplicate existing edges, add them to the list of edges.

What alternatives have you considered?

Maintaining redundancy.

Do you have any additional context?

This has been requested by initial users experimenting with the framework.