Account for memory used in SortKeyCursor by row format (spilling Sort)

**Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
As noted by @yjshen in https://github.com/apache/arrow-datafusion/pull/3386/files#r966573456, https://github.com/apache/arrow-datafusion/pull/3386 switches DataFusion to use a faster comparison method, but does not update the used memory calculation.

**Describe the solution you'd like**
We need to track the total memory used by all cursors since the cursor now holds Rows.

**Describe alternatives you've considered**
N/A

**Additional context**
See above

Start by reading PR #3386 and then trace the SortKeyCursor entry point used by spilling Sort. Confirm how cursors hold Rows and how memory is currently calculated; the work is done when total memory used by all cursors is included in that calculation.

Written by the indexing model from the issue text.