pg_dump: Add --no-publications option

doc/src/sgml/ref/pg_dump.sgml

doc/src/sgml/ref/pg_dumpall.sgml

doc/src/sgml/ref/pg_restore.sgml

src/bin/pg_dump/pg_backup.h

src/bin/pg_dump/pg_backup_archiver.c

src/bin/pg_dump/pg_dump.c

src/bin/pg_dump/pg_dumpall.c

src/bin/pg_dump/pg_restore.c