feat: support silentmode to mute engine log

[Duslia]

What type of PR is this?

feat

Check the PR title.

• This PR title match the format: <type>(optional scope): <description>.
• The description of this PR title is user-oriented and clear enough for others to understand.
• Attach the PR updating the user documentation if the current PR requires user awareness at the usage level. User docs repo.

(Optional) Translate the PR title into Chinese.

支持安静模式关闭 engine 的 log

(Optional) More detail description for this PR(en: English/zh: Chinese).

en: support silentmode to mute engine log
zh(optional): 支持安静模式关闭 engine 的 log

(Optional) Which issue(s) this PR fixes:

(Optional) The PR that updates user documentation:

cloudwego/cloudwego.github.io#632

[welkeyever]

加一个文档更新的 pr 链过来吧：https://www.cloudwego.io/zh/docs/hertz/tutorials/observability/log/ ；简单说明一下新功能。

[codecov]

Codecov Report

Patch coverage: 14.28% and project coverage change: -0.06 ⚠️

Comparison is base (4a6d3b1) 75.72% compared to head (f4fca03) 75.67%.

❗ Current head f4fca03 differs from pull request most recent head db90c32. Consider uploading reports for the commit db90c32 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #745      +/-   ##
===========================================
- Coverage    75.72%   75.67%   -0.06%     
===========================================
  Files           97       97              
  Lines         9464     9468       +4     
===========================================
- Hits          7167     7165       -2     
- Misses        1849     1853       +4     
- Partials       448      450       +2     

Impacted Files	Coverage Δ
pkg/common/hlog/hlog.go	80.00% <ø> (ø)
pkg/common/hlog/system.go	80.88% <0.00%> (-5.06%)	⬇️
pkg/route/engine.go	60.54% <0.00%> (ø)
pkg/protocol/multipart.go	77.21% <50.00%> (-2.54%)	⬇️

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