Add leapfrog support for opendal

[Xuanwo]

Integrate https://github.com/robclu/leapfrog with opendal's kv adapter

[Xuanwo]

It should be very interesting to bench all OpenDAL's kv service. 🤣

[PsiACE]

It should be very interesting to bench all OpenDAL's kv service. rofl

run bustle or ycsb for kvstore 😆 or a new workload

This seems to suggest that opendal has the potential to become a common benchmarking suite. (seems to be able to publish papers as well)

[Xuanwo]

Hi, #2222 has been added, we can restart leapfrog support now.

[Xuanwo]

cc @truc0, you can take moka as a reference to get started!

[TaiJuWu]

Leapfrog must use nightly rust version (not be used on the stable channel).
related issue: robclu/leapfrog#7

[A-Stupid-Sun]

hi @Xuanwo , I check the issue robclu/leapfrog#7, it seems Leapfrog is available in stable version? if it's fixed, may I try to fix this issue?
BTW, I 'm not currently familiar with Rust, so this task may take me a lot of time to complete。

[Xuanwo]

After recheck of the leapfrog's doc. Both leapfrog's key and value must be Copy which is impossible for OpenDAL. So we can't implement leapfrog support for OpenDAL.

This issue is invalid for now, let's close.

Thanks to the research and exploration conducted by @A-Stupid-Sun and @TaiJuWu.