Update npm scripts to simplify the benchmark command

[87xie]

Describe the feature

The recent rewrite #107 has significantly boosted performance!

Following these changes, it appears that the current benchmark scripts in package.json are outdated.

Could we update these scripts to reflect recent changes and ensure smooth execution of benchmark tasks? Additionally, it might be beneficial to clean up unused dev-dependencies such as benchmark, autocannon, etc.

Thank you for your attention to this matter!

Additional information

• Would you be willing to help implement this feature?

[pi0]

Thanks for suggestion. benchmarks dir includes detailed commands. (there is one top level pkg command but i probably remove it once automated via CI)