pgsql: Add stats_reset to pg_stat_all_{tables,indexes} and related view

Add stats_reset to pg_stat_all_{tables,indexes} and related views

It is possible to call pg_stat_reset_single_table_counters() on a
relation (index or table) but the reset time was missing from the system
views showing their statistics.

This commit adds the reset time as an attribute of pg_stat_all_tables,
pg_stat_all_indexes, and other relations related to them.

Bump catalog version.
Bump PGSTAT_FILE_FORMAT_ID, as a result of the new field added to
PgStat_StatTabEntry.

Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Reviewed-by: Sami Imseih <samimseih@gmail.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/aN8l182jKxEq1h9f@paquier.xyz

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/a5b543258aa29e181abe59b3183b685650d24651

Modified Files
--------------
doc/src/sgml/monitoring.sgml                 | 36 ++++++++++++++++++++++++++++
src/backend/catalog/system_views.sql         | 12 ++++++----
src/backend/utils/activity/pgstat.c          |  1 +
src/backend/utils/activity/pgstat_relation.c |  6 +++++
src/backend/utils/adt/pgstatfuncs.c          |  3 +++
src/include/catalog/catversion.h             |  2 +-
src/include/catalog/pg_proc.dat              |  4 ++++
src/include/pgstat.h                         |  4 +++-
src/include/utils/pgstat_internal.h          |  1 +
src/test/regress/expected/rules.out          | 36 ++++++++++++++++++----------
src/test/regress/expected/stats.out          | 34 ++++++++++++++++----------
src/test/regress/sql/stats.sql               | 11 ++++++---
12 files changed, 117 insertions(+), 33 deletions(-)