[Story] Decimal support in cudf-polars/libcudf for PDS-DS

[Matt711]

This story tracks work needed to enable running the PDS-DS benchmark suite with decimals.

[Matt711]

I'll pick this back up when we merge more of the queries.

• Q11: Add PDS-DS Q11 #19658
• Q12-16: Add PDS-DS Q12-16 #20389
• Q17-23: Add PDS-DS Q17-23 #20390
• Q24-29: Add PDS-DS Q24-29 #20392
• Q30-36: Add PDS-DS Q30-36 #20393
• Q37-43: Add PDS-DS Q37-43 #20394
• Q44-52: Add PDS-DS Q44-52 #20395
• Q53-62: Add PDS-DS Q53-62 #20399
• Q63-72: Add PDS-DS Q63-72 #20400
• Q73-85: Add PDS-DS Q73-85 #20402
• Q86-99: Add PDS-DS Q86-99 #20404