Better automatic naming for generated dataclasses

Currently, table named `table_with_underscores` would result in `Table_With_Underscores`.

Also, I would like to be able to name table `users` and get a class named `User`.

See this notebook/quarto page for a detailed example:
- https://github.com/ozpau/fastlite_improve_dataclass_automatic_name/blob/main/nbs/00_core.ipynb
- https://ozpau.github.io/fastlite_improve_dataclass_automatic_name/core.html