[C++] Standardize aggregation column order

[rtpsw]

Describe the enhancement requested

Change aggregation column order to segment-keys then keys then aggregates.

Component(s)

C++

[rtpsw]

cc @westonpace @icexelloss

[icexelloss]

This is a dup of #34908

I am in favor of using #34908 because it has a bit more explanation in it.

[westonpace]

Duplicate of #34908