Adds a flow.
This call would be atomic, either it fails and no jobs will be added to the queues, or it succeeds and all jobs will be added.
an object with a tree-like structure where children jobs will be processed before their parents.
Optional opts: FlowOptsoptions that will be applied to the flow object.
This class allows to add jobs with dependencies between them in such a way that it is possible to build complex flows. Note: A flow is a tree-like structure of jobs that depend on each other. Whenever the children of a given parent are completed, the parent will be processed, being able to access the children's result data. All Jobs can be in different queues, either children or parents,