Keep stats up to date for partitioned tables

In the long-going saga for analyze on partitioned tables, one thing I
missed while reverting 0827e8af70f4 is the maintenance of analyze count
and last analyze time for partitioned tables.  This is a mostly trivial
change that enables users assess the need for invoking manual ANALYZE on
partitioned tables.

This patch, posted by Justin and modified a bit by me (Álvaro), can be
mostly traced back to Hosoya-san, though any problems introduced with
the scissors are mine.

Backpatch to 14, in line with 6f8127b73901.

Co-authored-by: Yuzuko Hosoya <yuzukohos...@gmail.com>
Co-authored-by: Justin Pryzby <pry...@telsasoft.com>
Co-authored-by: Álvaro Herrera <alvhe...@alvh.no-ip.org>
Reported-by: Justin Pryzby <pry...@telsasoft.com>
Discussion: https://postgr.es/m/20210816222810.ge10...@telsasoft.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/375aed36ad83f0e021e9bdd3a0034c0c992c66dc

Modified Files
--------------
src/backend/commands/analyze.c  | 37 +++++++++++++++++++++++++------------
src/backend/postmaster/pgstat.c | 11 ++++++++---
2 files changed, 33 insertions(+), 15 deletions(-)

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