Improve vectorized operations of `GroupColumn`

### Is your feature request related to a problem or challenge?

Some good points about improving vectorized operations of `GroupColumn` from @Dandandan and @jayzhan211 in #12996 :

https://github.com/apache/datafusion/pull/12996#discussion_r1830810815
https://github.com/apache/datafusion/pull/12996#discussion_r1818475481
https://github.com/apache/datafusion/pull/12996#discussion_r1819225765
https://github.com/apache/datafusion/pull/12996#discussion_r1823772169

This pr is for tracking such points for conintuing improving performace of multi group by.

### Describe the solution you'd like

_No response_

### Describe alternatives you've considered

_No response_

### Additional context

_No response_

Start by reading the linked discussion in Apache DataFusion PR #12996, especially the referenced review comments, to identify the specific GroupColumn vectorization opportunities. Confirm the intended scope for improving multi-group-by performance and define completion through the relevant performance behavior or benchmarks discussed there.

Written by the indexing model from the issue text.