DAG Simulation Framework

[cdelcastillo21]

Implement DAG Simulation Framework.

1.) Base simulation class should have a 'parent' field, with parent simulation.
2.) _dag object -> Graph, _sims dictionary -> Maps simulation ID/name to DAG point.
3.) Entrypoint for sim is a call to a task list, that has DAG built into dependencies.
4.) run() into job.

Ideally want a framework that allows for the following (example):

sim = ADCPREP(parent=None)
sim = PADCIRC(parent=sim)
sim = ADCIRCOutputCompress(parent=sim)

sim.run()

i.e. - Can chain simulations.

5. TaskQueue handles execution of DAG.