Currently, test/format relies on config.sh to know what fields to include in its fuzzer.

Whenever api_data.py is updated with new fields, we need to update config.sh as well to take into account those new fields and make sure test/format use them (examples: WT-11348 / WT-12978.). This work could be avoided in config.sh would rely on api_data.py. Indeed, as soon as new a field would be added, test/format would be aware of it.

One thing to be aware of though - api_data.py contains lots of different fields that test/format may not need to play with.