New creates a new Pipeline that utilzes the Stage(s) in "sm".

Data will implement T in our Request[T] above.

Pipeline sets up a concurrent (kindof anyways) Pipeline.

Request is a Request to execute in the Pipeline.

StateMachine represents a statemachine where Start() is the entry Stage and you are directed to the next stage to run via Request[T].Next .

Stage is a stage in a statemachine.