planner: move more methods from StatsHandle to its sub-packages (#47749)#47872

Merged

ti-chi-bot[bot] merged 3 commits intopingcap:release-7.5from ti-chi-bot:cherry-pick-47749-to-release-7.5

Oct 23, 2023

+106-149

Commits on Oct 20, 2023

This is an automated cherry-pick of pingcap#47749

qw4990
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ti-chi-bot
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Commits on Oct 23, 2023

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hawkingrei
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hawkingrei
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