Non text modes for pg_dumpall, correspondingly change pg_restore

pg_dumpall acquires a new -F/--format option, with the same meanings as
pg_dump. The default is p, meaning plain text. For any other value, a
directory is created containing two files, globals.data and map.dat. The
first contains SQL for restoring the global data, and the second
contains a map from oids to database names. It will also contain a
subdirectory called databases, inside which it will create archives in
the specified format, named using the database oids.

In these casess the -f argument is required.

If pg_restore encounters a directory containing globals.dat, and no
toc.dat, it restores the global settings and then restores each
database.

pg_restore acquires two new options: -g/--globals-only which suppresses
restoration of any databases, and --exclude-database which inhibits
restoration of particualr database(s) in the same way the same option
works in pg_dumpall.

Author: Mahendra Singh Thalor <mahi6run@gmail.com>
Co-authored-by:  Andrew Dunstan <andrew@dunslane.net>
Reviewed-by: jian he <jian.universality@gmail.com>
Reviewed-by: Srinath Reddy <srinath2133@gmail.com>
Reviewed-by: Álvaro Herrera <alvherre@alvh.no-ip.org>

Discussion: https://postgr.es/m/cb103623-8ee6-4ba5-a2c9-f32e3a4933fa@dunslane.net

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