statistics background update in-memory objects worker reads a lot of unneeded items from storage

[winoros]

Enhancement

From #57631 (comment), we'll see that TiDB reads all the stats_meta whose last_update_version is higher than the given timestamp.
And it's not the end. It will then call TableStatsFromStorage for every table_id read from stats_meta and read all the things from mysql.stats_histogram, mysql.stats_top_n and mysql.stats_buckets.
It's a big waste since most of the tables are just updating the row count and modified_count and rare of them will be analyzed.
We need a more accurate control for the background worker to only read the things really needed to update the in-memory stats objects.

[Rustin170506]

duplicate of #57868