feat(hz): optimize the naming style for middleware

[FGYFFFF]

What type of PR is this?

feat

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• 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.

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优化中间件的命名方式

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

en: optimize the naming style for middleware
zh(optional): 优化中间件的命名方式
修改内容：

• 严格区分"组中间件"和"handler中间件"的命名

形如 "a/b" & "a/b/c" 这种路由的定义，生成的代码如下:

root := r.Group("/", rootMw()...)
{
    _a := root.Group("/a", _aMw()...)
    _a.GET("/b", append(_bMw(), hertz.Method1)...)
    _b := _a.Group("/b", _bMw()...)
    _b.POST("/c", append(_method2Mw(), hertz.Method2)...)
}

可以看到_a.GET("/b", append(_bMw(), hertz.Method1)...)和_b := _a.Group("/b", _bMw()...)共用了同一个 middleware 函数。产生问题的原因是没有严格区分 "group middleware" 和 "handler middleware" 的命名方式，导致生产的代码共用了同一个中间件函数。

预期生成的代码为：

root := r.Group("/", rootMw()...)
{
    _a := root.Group("/a", _aMw()...)
    _a.GET("/b", append(_method1Mw(), hertz.Method1)...)
    _b := _a.Group("/b", _bMw()...)
    _b.POST("/c", append(_method2Mw(), hertz.Method2)...)
}

是否有break：
如果有类似的路由注册，会多生成一个中间件，需要用户本身注意下是否需要增加修改中间件的内容

• 增加中间件命名风格：
  增加以 "path" 作为分隔的中间件命名分隔，例如"a_b_mws()"；从而不需要对中间件的命名进行 "Unique" 操作，进而对齐内部的命名方式

• 修复了一个命名转换的bug，会错误地将 "A"->"_"

Which issue(s) this PR fixes:

[codecov]

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Additional details and impacted files

@@           Coverage Diff            @@
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========================================
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========================================
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[welkeyever]

_a := root.Group("/a", _aMw()...)
如果是这样的命名风格，实际上如果有注册/a/a/c的场景，就变成：
_a := _a.Group("/a", _aMw()...)
_a.POST("/c", append(_method2Mw(), hertz.Method2)...)
了？

[FGYFFFF]

_a := root.Group("/a", _aMw()...) 如果是这样的命名风格，实际上如果有注册/a/a/c的场景，就变成： _a := _a.Group("/a", _aMw()...) _a.POST("/c", append(_method2Mw(), hertz.Method2)...) 了？

这里解了命名冲突，会生成如下：

root := r.Group("/", rootMw()...)
{
_a := root.Group("/a", _aMw()...)
{
	_a0 := _a.Group("/a", _a0Mw()...)
	_a0.GET("/b", append(_method1Mw(), hertz.Method1)...)
}
}