Add support for SortAggregateExec

### What is the problem the feature request solves?

I was experimenting with some benchmarking and noticed that we do not yet have a native version of `SortAggregateExec`. This resulted in poor performance due to `CometColumnarToRow` being inserted into the plan.

```
Execute InsertIntoHadoopFsRelationCommand [COMET: Execute InsertIntoHadoopFsRelationCommand is not supported]
+- WriteFiles [COMET: WriteFiles is not supported]
+- Window [COMET: Partitioning and sorting specifications must be the same.]
+- CometSort
+- AQEShuffleRead
+- CometSinkPlaceHolder
+- CometColumnarExchange
+- SortAggregate [COMET: SortAggregate is not supported]
+- CometColumnarToRow
+- CometSort
+- AQEShuffleRead
+- CometColumnarExchange
+- SortAggregate [COMET: SortAggregate is not supported]
+- CometColumnarToRow
+- CometSort
+- CometScan parquet
```

### Describe the potential solution

We should see what is involved in implementing `SortAggregateExec` natively.

### Additional context

_No response_