Extract the FERC 714 XBRL annual load forecast table

[aesharpe]

• In the CSVs exported from DBF is Part 3 Schedule 2 - Planning Area Forecast Demand.csv
• In the XBRL data this table is planning_area_hourly_demand_and_forecast_summer_and_winter_peak_demand_and_annual_net_energy_for_load_table_03_2_duration
• In PUDL this table is core_ferc714__yearly_planning_area_demand_forecast

There are a couple of other tables which also come from Part 3 Schedule 2, which is confusing.