pgsql: Add logical decoding status to pg_control_checkpoint().

Add logical decoding status to pg_control_checkpoint().

Commit 8108765f04b added the logical decoding status to the
pg_controldata output, but overlooked the pg_control_checkpoint() SQL
function, which reports the same checkpoint information. This commit
adds a logical_decoding column to pg_control_checkpoint(), placed
after full_page_writes to match the pg_controldata output order.

Oversight in 8108765f04b.

Bump catalog version.

Reported-by: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>
Discussion: https://postgr.es/m/CAHGQGwEkp1-1n5iC38+yHSNh955+KshwtCL6DzA0vk_vuUF_Eg@mail.gmail.com
Backpatch-through: 19

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/99e949f846e9d4c02296795ad041e55d88b1d320

Modified Files
--------------
doc/src/sgml/func/func-info.sgml | 5 +++++
src/backend/utils/misc/pg_controldata.c | 35 ++++++++++++++++++---------------
src/include/catalog/catversion.h | 2 +-
src/include/catalog/pg_proc.dat | 6 +++---
4 files changed, 28 insertions(+), 20 deletions(-)