R1:161ebad56d7a

Improve Conduit type handling for `*.edit` endpoints

Summary:
Ref T9964. Three goals here:

- Make it easier to supply Conduit documentation.
- Make automatic documentation for `*.edit` endpoints more complete, particularly for custom fields.
- Allow type resolution via Conduit types, so you can pass `["alincoln"]` to "subscribers" instead of needing to use PHIDs.

Test Plan:
- Viewed and used all search and edit endpoints, including custom fields.
- Used parameter type resolution to set…