move(data/prod/*): A `prod` folder (#13771)
Create folder `data.prod.` to hold `prod` files and related types. Precisely:
* `data.prod` → `data.prod.basic`
* `data.pprod` → `data.prod.pprod`
* `data.tprod` → `data.prod.tprod`
* `order.lexicographic` → `data.prod.lex`
