pg_dump: Allow dumping data of specific foreign servers

The new command-line switch --include-foreign-data=PATTERN lets the user
specify foreign servers from which to dump foreign table data.  This can
be refined by further inclusion/exclusion switches, so that the user has
full control over which tables to dump.

A limitation is that this doesn't work in combination with parallel
dumps, for implementation reasons.  This might be lifted in the future,
but requires shuffling some code around.

Author: Luis Carril <luis.car...@swarm64.com>
Reviewed-by: Daniel Gustafsson <dan...@yesql.se>
Reviewed-by: Surafel Temesgen <surafel3...@gmail.com>
Reviewed-by: vignesh C <vignes...@gmail.com>
Reviewed-by: Álvaro Herrera <alvhe...@2ndquadrant.com>
Discussion: 
https://postgr.es/m/lejpr01mb0185483c0079d2f651b16231e7...@lejpr01mb0185.deuprd01.prod.outlook.de

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/2f9eb31320948b968e5f744b73032405e1f25225

Modified Files
--------------
doc/src/sgml/ref/pg_dump.sgml                |  30 ++++++++
src/bin/pg_dump/pg_dump.c                    | 110 +++++++++++++++++++++++++--
src/bin/pg_dump/pg_dump.h                    |   1 +
src/bin/pg_dump/t/001_basic.pl               |  14 +++-
src/bin/pg_dump/t/003_pg_dump_with_server.pl |  36 +++++++++
5 files changed, 185 insertions(+), 6 deletions(-)

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