Test: Use unchecked group_value access in group hash #7010
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Related to #6969
Inspired by the @yahoNanJing 's work in apache/arrow-rs#4524 (comment) I am seeing how much extra performance there is to be gained via inlining and unchecked access in group keys: apache/arrow-rs#4539
I think there is still substantial performance to be had by avoiding the row format entirely for single column groups, but I will explore that theory later