Clean up EIA-861 and FERC-714 core assets

[zaneselvans]

Once upon a time, in time of plague, political instability, and a wrathful atmosphere we created "interim" EIA-861 and FERC-714 tables which have (shocker) stuck around virtually unchanged for 4 years and are now being distributed in the PUDL DB. But they need some love. We rediscovered these issues during the Great Rename (#2765, #3061) while fleshing out field and resource descriptions in #3283 / #3224, but decided to put off further structural cleanup and renaming since it would be involved. This is a higher level organizing issue that will track the cleanup tasks we've identified for these two "interim" datasets which were born together in the depths of despair like the Winklevoss Twins.

EIA-861

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1. Clean up EIA-861 table and column names #3301
   eia861 metadata +2
2. Consolidate pv_current_flow_type with other net metering fields rather than core_eia861__yearly_net_metering_misc
3. Clarify meaning and structure of EIA-861 business_model field #3323
   data-cleaning eia861 +2
4. Revisit normalization of EIA-861 distributed generation fuel data #3324
   data-cleaning eia861 +2
5. Integrate the dispersed_generation tables (not grid-connected)

FERC-714

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1. Revise FERC-714 Table Structures #3198
   0 of 3
   ferc714 +1