[I] EPIC: complete GroupValuesColumn [datafusion]

["alamb (via GitHub)" <gi...@apache.org>]

alamb opened a new issue, #24268:
URL: https://github.com/apache/datafusion/issues/24268

   ### Is your feature request related to a problem or challenge?
   
   ## Background
   
   When running a query like `SELECT ... GROUP BY x, y` the DataFusion grouping operator computes / stores the group keys using an instance of the [`GroupValuesColumn`](https://docs.rs/datafusion/latest/datafusion/physical_plan/aggregates/group_values/multi_group_by/struct.GroupValuesColumn.html)  trait.
   
   This trait is a column-wise  provides type-specific specializations under [`multi_group_by`](https://github.com/apache/datafusion/blob/1b27f348c97c6eb65d922cb1a208465a2f109311/datafusion/physical-plan/src/aggregates/group_values/multi_group_by/mod.rs#L1-L0) 
   
   If any one of the group by keys does not have a specialization of `GroupValuesColumn` DataFusion falls back to the general, but slower byte-encoded [`GroupValuesRows`](https://github.com/apache/datafusion/blob/68d587468073c1fc84ffe00db66f35d506dcc828/datafusion/physical-plan/src/aggregates/group_values/row.rs#L46-L45). 
   
   ## Definition of Done
   This EPIC tracks **completing the GroupValuesColumn type coverage** so that  [`GroupValuesRows`](https://github.com/apache/datafusion/blob/68d587468073c1fc84ffe00db66f35d506dcc828/datafusion/physical-plan/src/aggregates/group_values/row.rs#L46-L45) can be removed
   
   
   
   ## Subtasks
   
   - [ ] #22682 — `FixedSizeList<primitive>`, `List<T>`, `LargeList<T>`, `Struct<...>` with recursive children. In flight via PR #22706 (split into 5 stacked PRs per maintainer request).
   
   
   ### Describe the solution you'd like
   
   _No response_
   
   ### Describe alternatives you've considered
   
   _No response_
   
   ### Additional context
   
   _No response_


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