make query caches use `Sharded` only for multiple threads#115162

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SparrowLii wants to merge 2 commits intorust-lang:masterfrom

SparrowLii:parallel_query_cache

Commits on Aug 24, 2023

make sharded query caches only for multiple threads
SparrowLii
committed

Commits on Aug 25, 2023

use `RefCell` for query caches in single thread
SparrowLii
committed