Ciemss ensemble simulate

[mwdchang]

Summary

This PR brings the ciemss-ensemble-simulate operator up to date with the design sketches, and fix various bugs along the way. Because this dates back to when logic was on the node, or partially split across both node/drilldown - the changes here are quite drastic. It might be better to view this as a rewrite than a UI-update.

Note 1: we don't have ensembled results, there is a bug on ciemss, the result data are just showing individual states from each input model configurations.

Note 2: currently this will error out if the input models have different structure. e.g. you cannot do SEIRD + SIR, but you can do two different SIR configs.

The new mechanics:

• Drilldown initializes the state and run the simulation
• Node will poll/pull simulation result of the "active" output

TODOs:

• Display actual ensemble results
• Clean up UI, there are a handful of UUIDs that should be replaced with names
• Clean up polling process and precedence across node/drilldown, currently you need to stay in the drilldown for the simulation to finish running.