Make nodeSort.c use Datum sorts for single column sorts

Datum sorts can be significantly faster than tuple sorts, especially when
the data type being sorted is a pass-by-value type.  Something in the
region of 50-70% performance improvements appear to be possible.

Just in case there's any confusion; the Datum sort is only used when the
targetlist of the Sort node contains a single column, not when there's a
single column in the sort key and multiple items in the target list.

Author: Ronan Dunklau
Reviewed-by: James Coleman, David Rowley, Ranier Vilela, Hou Zhijie
Tested-by: John Naylor
Discussion: https://postgr.es/m/3177670.itZtoPt7T5@aivenronan

src/include/nodes/execnodes.h

@@ -2151,6 +2151,7 @@ typedef struct SortState
 	int64		bound_Done;		/* value of bound we did the sort with */
 	void	   *tuplesortstate; /* private state of tuplesort.c */
 	bool		am_worker;		/* are we a worker? */
+	bool		datumSort;		/* Datum sort instead of tuple sort? */
 	SharedSortInfo *shared_info;	/* one entry per worker */
 } SortState;