LCOH & LCOC SAM cash flow

[softwareengineerprogrammer]

Description

Sub-PR of #143

TODO (outstanding items rolled into parent PR):

1. 🚧 Apply CAPEX_heat_electricity_plant_ratio per existing LCO* logic
   1. apply to LCOE: Present value of annual costs ($) -> Present value of annual energy costs ($)...: c812574
   2. Assess overall correctness/accuracy of approach - can we get away with just applying the fraction to PV of costs?
2. Deduplicate calls to calculate_pre_revenue_costs_and_cashflow NatLabRockies/GEOPHIRES-X#452
3. Units
   1. Cooling provided in kWh, not kWh/yr
4. LCOC: 0548958