Starting structure for OM refactor

[elenya-grant]

Starting structure for OM refactor

This PR requires PR #90 to be merged in!

This PR introduces a different structure of the functionality within the electrolyzer repo to accommodate an Open-MDAO structure. This is in a somewhat intermediate state so that future development has smaller PRs and can have more rigorous testing and a focus on individual component development. This PR really focuses on the structure for the "cluster" and the connection from a cluster to a controller. The "controller" right now is just an IndepVarComp because the structure is only set-up to handle one cluster at the moment. The cluster is comprised of 3 main subgroups:

1. converter: perhaps this should be renamed to "pre_translator". This defines the current operational bounds and also is used to get curve coefficients for the power-to-current conversion.
2. translator: this is used to take a cluster input power signal and convert it to the cell-level current input
3. simulation: this takes the cell-level current input and simulates cell degradation, includes dynamic operating constraints, and simulates the cell performance.

Plans for follow-on PRs:

• update framework to handle hydrogen as the control variable (Issue OM Structure: Hydrogen control variable #93)
• update framework so that all cell design variables are promoted to the top-level (Issue OM Structure: Update framework so cell design variables are promoted to higher-level #94)
• update framework to use multiple clusters with a controller (Issue OM Structure: Multiple Clusters Connected to a Controller #95)
• add component that tracks how close to EOL the cluster is and when its replacement schedule is (Issue OM Refactor: Component to Track Remaining Life #96)
• add a component to "classify" the cluster and system (rated capacity, etc)
• add a "scale-up" component after the "simulation" component to scale outputs (Issue OM Refactor: Scale-up components and System Classification #97)
• add a system-type component (or something?) that can handle cases if multiple feedstocks are limiting (Issue OM Refactor: Feedstock limited cases #98)

Files to Remove (were helper/drafts):

• electrolyzer/translators/power_translator_baseclass.py
• electrolyzer/core/simulate_structure.py
• electrolyzer/core/pre_processing_structure_v2.py

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