refactor: refine small object disk cache (#761) #134

Job	Run time
run with single worker thread and deadlock detection	5m 24s
run with address saniziter	6m 25s
run with leak saniziter	5m 30s
check build with madsim	2m 44s
misc check	5s
rust ffmt check (ubuntu-latest)	19s
rust test with codecov (ubuntu-latest, stable)	10m 25s
rust udeps test (ubuntu-latest)	1m 44s
rust ffmt check (macos-latest)	18s
rust udeps test (macos-latest)	1m 28s
rust ffmt check (windows-latest)	30s
rust test with codecov (ubuntu-latest, 1.81.0)	10m 28s
rust udeps test (windows-latest)	3m 51s
rust test with codecov (macos-latest, stable)	4m 48s
rust test with codecov (macos-latest, 1.81.0)	5m 1s
rust test with codecov (windows-latest, stable)	10m 24s
rust test with codecov (windows-latest, 1.81.0)	9m 59s
	1h 19m 23s

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