Support TZ format code in to_timestamp()

When Who What
2024-01-25 22:47:24 Tom Lane (tgl) Closed in commitfest 2024-01 with status: Committed
2024-01-25 22:47:24 Tom Lane (tgl) Changed committer to tgl
2024-01-22 15:26:24 Aleksander Alekseev (a.alekseev) Added a.alekseev as reviewer
2023-12-04 10:11:37 John Naylor (john.naylor) Closed in commitfest 2023-11 with status: Moved to next CF
2023-10-02 10:00:23 Peter Eisentraut (petere) Closed in commitfest 2023-09 with status: Moved to next CF
2023-08-03 08:20:32 Daniel Gustafsson (d_gustafsson) Closed in commitfest 2023-07 with status: Moved to next CF
2023-06-13 16:29:20 Tom Lane (tgl) Changed authors to Tom Lane (tgl)
2023-06-13 16:29:11 Tom Lane (tgl) Attached mail thread 1681086.1686673242@sss.pgh.pa.us
2023-06-13 16:29:11 Tom Lane (tgl) Created patch record