Track per-relation cumulative time spent in [auto]vacuum and [auto]analyze

This commit adds four fields to the statistics of relations, aggregating
the amount of time spent for each operation on a relation:
- total_vacuum_time, for manual vacuum.
- total_autovacuum_time, for vacuum done by the autovacuum daemon.
- total_analyze_time, for manual analyze.
- total_autoanalyze_time, for analyze done by the autovacuum daemon.

This gives users the option to derive the average time spent for these
operations with the help of the related "count" fields.

Bump catalog version (for the catalog changes) and PGSTAT_FILE_FORMAT_ID
(for the additions in PgStat_StatTabEntry).

Author: Sami Imseih
Reviewed-by: Bertrand Drouvot, Michael Paquier
Discussion: https://postgr.es/m/CAA5RZ0uVOGBYmPEeGF2d1B_67tgNjKx_bKDuL+oUftuoz+=Y1g@mail.gmail.com

src/backend/commands/analyze.c

@@ -344,8 +344,8 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
 	RestrictSearchPath();
 
 	/*
-	 * measure elapsed time if called with verbose or if autovacuum logging
-	 * requires it
+	 * When verbose or autovacuum logging is used, initialize a resource usage
+	 * snapshot and optionally track I/O timing.
 	 */
 	if (instrument)
 	{
@@ -356,9 +356,11 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
 		}
 
 		pg_rusage_init(&ru0);
-		starttime = GetCurrentTimestamp();
 	}
 
+	/* Used for instrumentation and stats report */
+	starttime = GetCurrentTimestamp();
+
 	/*
 	 * Determine which columns to analyze
 	 *
@@ -693,9 +695,9 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
 	 */
 	if (!inh)
 		pgstat_report_analyze(onerel, totalrows, totaldeadrows,
-							  (va_cols == NIL));
+							  (va_cols == NIL), starttime);
 	else if (onerel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
-		pgstat_report_analyze(onerel, 0, 0, (va_cols == NIL));
+		pgstat_report_analyze(onerel, 0, 0, (va_cols == NIL), starttime);
 
 	/*
 	 * If this isn't part of VACUUM ANALYZE, let index AMs do cleanup.