Integration tests in Rust

[tisonkun]

Reference:

• https://github.com/redis-rs/redis-rs/blob/c21c2df6d8e18fbaab06de5b3d6617f72bf6c6e8/tests/test_acl.rs
• https://github.com/redis-rs/redis-rs/blob/c21c2df6d8e18fbaab06de5b3d6617f72bf6c6e8/.github/workflows/rust.yml

TCL tests are somehow hard to debug, and here is a potential alternative provided by redis-rs. Although, I didn't spend too much time on this part now. Perhaps I'll update this thread with a prototype later :P

[tisonkun]

FWIW, I'm playing in this branch: https://github.com/tisonkun/incubator-kvrocks/tree/rscase