[REFACTOR] unify singular/plural semantic naming of columns

[davidberenstein1957]

Is your feature request related to a problem? Please describe. I feel distinguishing between singular and plural names complicates workflows and code, e.g., “generation” and “generations”, and I’ve seen similar scenarios with other columns like “answer”/“rationale”. I’ve seen similar scenarios with other columns like “answer”/“rationale”.

Describe the solution you'd like Let's simplify this and keep only the plural

Describe alternatives you've considered NA

Additional context NA