Use named boolean parameters for pg_get_*_ddl option arguments

Replace the VARIADIC text[] alternating key/value option interface with
typed named boolean parameters for pg_get_role_ddl(), pg_get_tablespace_ddl(),
and pg_get_database_ddl(), as added by commit 4881981f920 and friends.
The new signatures are:

  pg_get_role_ddl(role regrole,
                  pretty boolean DEFAULT false,
                  memberships boolean DEFAULT true)

  pg_get_tablespace_ddl(tablespace oid/name,
                        pretty boolean DEFAULT false,
                        owner boolean DEFAULT true)

  pg_get_database_ddl(db regdatabase,
                      pretty boolean DEFAULT false,
                      owner boolean DEFAULT true,
                      tablespace boolean DEFAULT true)

This provides type safety at the SQL level, allows named-argument calling
syntax (pretty => true), removes the runtime string-parsing machinery
(DdlOption, parse_ddl_options) in favour of direct PG_GETARG_BOOL() calls,
and allows the functions to be marked STRICT.

While we're here, I added an extra TAP test for pg_get_database(owner =>
false, ...)

Catalog version bumped.

Author: Jelte Fennema-Nio <[email protected]>
Discussion: https://postgr.es/m/[email protected]
(and on Discord)

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/d6ed87d19890b1cfa93d1f6e8957fa525834c0e2

Modified Files
--------------
doc/src/sgml/func/func-info.sgml             |  54 +++---
src/backend/utils/adt/ddlutils.c             | 260 +++------------------------
src/include/catalog/catversion.h             |   2 +-
src/include/catalog/pg_proc.dat              |  41 +++--
src/test/modules/test_misc/t/012_ddlutils.pl |  28 +--
5 files changed, 95 insertions(+), 290 deletions(-)

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