refactor: binding

[FGYFFFF]

What type of PR is this?

refactor

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.

(Optional) Translate the PR title into Chinese.

重构 hertz 参数绑定

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

zh:
绑定：

• 支持的类型：基本类型、数组/切片、map、struct、typedef、多重指针
• 多 tag 绑定：优先级：path > form > query > cookie > header > json > raw_body
• 最大努力绑定：先尝试解析 body 做 unmarshal，再绑定 http 信息
• required 校验
• 自定义类型绑定
• 设置默认值
• 绑定文件
• 没加 tag 自动遍历所有 tag
• 复杂类型的默认值(map、slice、struct 等类型的默认值)
• 替换自定义绑定函数的注册方式，便于对一些 Known-Struct 进行拓展
• json unmarshal 后的默认值覆盖以及required校验
• 对于 struct Field 要不要也提供一个 decoder，用于直接 unmarshal(实现类似 map field)

en:
binding:

• supported type：base type、array/slice、map、struct、typedef、multiple pointer
• multiple tag binding：Priority：path > form > query > cookie > header > json > raw_body
• best effort binding：First try to parse the body to do unmarshal, then bind the http information
• required validate
• custom type binding
• set default value
• file binding
• without tag automatically traverses all tags

Which issue(s) this PR fixes:

[codecov]

Codecov Report

Patch coverage: 80.35% and project coverage change: -0.19% ⚠️

Comparison is base (02112cc) 82.01% compared to head (1dc1af0) 81.82%.

❗ Current head 1dc1af0 differs from pull request most recent head 256f9bb. Consider uploading reports for the commit 256f9bb to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #541      +/-   ##
===========================================
- Coverage    82.01%   81.82%   -0.19%     
===========================================
  Files           97       98       +1     
  Lines         9663     9900     +237     
===========================================
+ Hits          7925     8101     +176     
- Misses        1261     1311      +50     
- Partials       477      488      +11     

Files Changed	Coverage Δ
pkg/common/config/option.go	100.00% <ø> (ø)
pkg/app/server/binding/config.go	71.11% <71.11%> (ø)
pkg/app/context.go	93.41% <71.73%> (-2.02%)	⬇️
pkg/route/engine.go	61.58% <76.92%> (+0.83%)	⬆️
pkg/common/utils/utils.go	85.71% <80.00%> (-0.78%)	⬇️
pkg/app/server/binding/default.go	82.53% <82.53%> (ø)
pkg/app/server/binding/reflect.go	100.00% <100.00%> (ø)
pkg/app/server/option.go	98.73% <100.00%> (+0.10%)	⬆️

... and 1 file with indirect coverage changes

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[welkeyever]

LGTM & welldone, GL.