feat(CuckooFilter): add cf.exists and cf.mexists command

[nagisa-kunhah]

task id: #3359

[nagisa-kunhah]

@jihuayu Sorry for the noise. The initial version of this PR branch accidentally contained replayed upstream commits because it was not cleanly rebased onto the latest upstream/unstable. This caused GitHub to show unrelated files in the PR diff and also created automatic cross-references to other PRs from the replayed commit messages.
Can we clear these messages？

[jihuayu]

@nagisa-kunhah Thank you for your contribution. It doesn't matter. I only care about the code diff.
However, please take note: you need to understand all the code you submit, as you will be held ultimately responsible for it.

Please @ me if you have any other questions.

Tips:

• Please read Guidelines for AI-assisted Contributions
• If you used AI tools, please let us know which tools and models you used; this helps us assess the reliability of the code.