Convert contrib SQL functions to new style

When Who What
2021-09-01 17:28:10 Tom Lane (tgl) Closed in commitfest 2021-09 with status: Returned with feedback
2021-09-01 07:26:26 Peter Eisentraut (petere) New status: Waiting on Author
2021-08-03 02:33:49 Masahiko Sawada (masahikosawada) Closed in commitfest 2021-07 with status: Moved to next CF
2021-04-15 02:08:20 Tom Lane (tgl) Changed targetversion to None
2021-04-13 22:37:28 Tom Lane (tgl) Changed authors to Tom Lane (tgl)
2021-04-13 22:37:28 Tom Lane (tgl) Changed targetversion to 14
2021-04-13 22:37:03 Tom Lane (tgl) Attached mail thread 3395418.1618352794@sss.pgh.pa.us
2021-04-13 22:37:03 Tom Lane (tgl) Created patch record