feat: skip block cache deallocation to make shutdown fast

[wanghenshui]

when blockcache size is too big, skip dtor could save shutdown time

ref https://groups.google.com/g/rocksdb/c/xQ_o9jWoFqg

[torwig]

@wanghenshui You can run ./x.py format before committing changes to format the code.

[PragmaTwice]

Also we need to add a go test case for it.

[mapleFU]

PrepareRestoreDB() also call CloseDB, should it prevent from unmanage memory?

[wanghenshui]

PrepareRestoreDB() also call CloseDB, should it prevent from unmanage memory?

yes. i 'll make a single function from CloseDB, not inside it

[mapleFU]

General LGTM but maybe in the future we can have better method for this, I think this flag can be set only when cli/main.cc. But this is also ok to me

[sonarqubecloud]

Quality Gate failed

Failed conditions
B Maintainability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

Catch issues before they fail your Quality Gate with our IDE extension SonarQube for IDE