pgsql: Add backup_type column to pg_stat_progress_basebackup.

Add backup_type column to pg_stat_progress_basebackup.

This commit introduces a new column backup_type that indicates the
type of backup being performed: either 'full' or 'incremental'.

Bump catalog version.

Author: Shinya Kato <shinya11.kato@gmail.com>
Reviewed-by: Yugo Nagata <nagata@sraoss.co.jp>
Discussion: https://postgr.es/m/CAOzEurQuzbHwTj1ehk1a+eeQDidJPyrE5s6mYumkjwjZnurhkQ@mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/deb674454c5cb7ecabecee2e04ca929eee570df4

Modified Files
--------------
doc/src/sgml/monitoring.sgml             | 10 ++++++++++
src/backend/backup/basebackup.c          |  2 +-
src/backend/backup/basebackup_progress.c |  9 +++++++--
src/backend/catalog/system_views.sql     |  5 ++++-
src/include/backup/basebackup_sink.h     |  3 ++-
src/include/catalog/catversion.h         |  2 +-
src/include/commands/progress.h          |  5 +++++
src/test/regress/expected/rules.out      |  7 ++++++-
8 files changed, 36 insertions(+), 7 deletions(-)