Add psql PROMPT variable for search_path.

The new %S substitution shows the current value of search_path.
Note that this only works when connected to Postgres v18 or newer,
since search_path was first marked as GUC_REPORT in commit
28a1121fd9.  On older versions that don't report search_path, %S is
replaced with a question mark.

Suggested-by: Lauri Siltanen <[email protected]>
Author: Florents Tselai <[email protected]>
Reviewed-by: Jelte Fennema-Nio <[email protected]>
Reviewed-by: Jim Jones <[email protected]>
Reviewed-by: Chao Li <[email protected]>
Discussion: 
https://postgr.es/m/CANsM767JhTKCRagTaq5Lz52fVwLPVkhSpyD1C%2BOrridGv0SO0A%40mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/b3ce55f413cdf70b1bc4724052fb4eacf9de239a

Modified Files
--------------
doc/src/sgml/ref/psql-ref.sgml | 11 +++++++++++
src/bin/psql/prompt.c          | 11 +++++++++++
2 files changed, 22 insertions(+)

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