Create documentation that explains new naming convention to users and contributors

[bendnorman]

• user-facing documentation explains new naming convention
• contributor-facing documentation explains asset creation guidelines & goes in depth about intermediate assets

Tasks

Beta Give feedback

1. Add section to release notes explaining the name change
2. Create a final old table_name, new_table_name and pudltabl method reference for uses
3. Add a note about ferc schedule descriptions in the naming convention docs
4. Add a note that assets with multiple sources like in assn, should use the same order
5. Explain when it is appropriate to use pudl as a source. See comment Rename FERC Form 1 core and output assets #2992 (comment)

[bendnorman]

Closed #2874 and #3028