refactor: bench client

[Kikkon]

Please briefly answer these questions:

• what problem are you trying to solve? (or if there's no problem, what's the motivation for this change?)
  slove Refactor BenchClient's implementation #486
• what changes does this pull request make?
  refactored the internal implementation of the beanch client."
• are there any non-obvious implications of these changes? (does it break compatibility with previous versions, etc)
  no

[Phoenix500526]

Please modify the code and make it pass the Clippy ci process.

[themanforfree]

Looks like you're referencing the wrong issue number, please update it.

[Phoenix500526]

Please modify your code to make it pass the clippy ci process. You can run cargo clippy --all-targets --all-features -- -D warnings in your local code.

[Phoenix500526]

Please modify the last commit message and make it meet the requirement of "Conventional Commits". FYI: https://github.com/xline-kv/Xline/blob/master/CONTRIBUTING.md#commit-message-guidelines

[Phoenix500526]

During the CI process of this PR, the test case test_range_redirect panicked. I think it's a bug and not introduced by this PR. Could you please help to create a related issue to report this bug to the Xline community?

[codecov]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (84c685a) 54.12% compared to head (0c25650) 63.55%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #496      +/-   ##
==========================================
+ Coverage   54.12%   63.55%   +9.43%     
==========================================
  Files         101      101              
  Lines       18287    18333      +46     
  Branches    18287    18333      +46     
==========================================
+ Hits         9898    11652    +1754     
+ Misses       7804     5956    -1848     
- Partials      585      725     +140     

Files	Coverage Δ
benchmark/src/bench_client.rs	67.74% <75.80%> (+67.74%)	⬆️

... and 43 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Phoenix500526]

LGTM

[iGxnon]

LGTM