[feature]: replace hardcoding "/tmp/xxx" path

[lxl66566]

currently we use many /tmp/xxx temp directory on db testing, and needs manually delete the dir in the end of test.
It's better to use some crate like tempfile to help us.

pros:

• no need to delete folders manually. programmers may forget to add remove code after testing.
• no need to worry about folder name collision. each test will always use different folder.
• although xline only supports test on linux, it's not bad to add some cross-platform ability.

things to do:

• add crate to [dev-dependencies] and replace /tmp/xxx path
• for those using /tmp/xxx path not in test mod, ex. crates/xline/src/server/command.rs, use std::env::temp_dir instead.
  • for this ex. case, we need to define a function to generate snapshot path from uuid. It's not a good idea to use hardcoded string in coding.

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[cswpy]

Hello there, I am new to the project and would love to contribute! I’d love to take a stab at this one.

[liangyuanpeng]

feel free to comment /assignme for assign it, and welcome :)

[cswpy]

/assignme