Support relabel path of ehttp client to solve the high cardinality issue

[clannadxr]

HTTP 客户端的请求的 path 里如果有参数会在指标系统里产生高基数问题

一般场景下，通过在 url 里加上参数占位符，并设置 path 参数可以解决这一问题，如：

comp.R().SetPathParam("foo", "bar").Get("/id/{foo}")

这样拦截器里获取的 url path 会是 /id{foo}

但有些场景，如：使用 ehttp 客户端转发请求时，我们并不方便使用上述方式一个一个指定请求 url，这时候可能需要支持配置 path 的重写规则，匹配带参数 path 重命名为统一的 path

注意使用该配置会带来一定的性能开销

[codecov]

Codecov Report

Merging #322 (6511233) into master (ca292bd) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #322      +/-   ##
==========================================
- Coverage   58.72%   58.68%   -0.04%     
==========================================
  Files          80       80              
  Lines        2958     2958              
==========================================
- Hits         1737     1736       -1     
  Misses       1055     1055              
- Partials      166      167       +1     

Flag	Coverage Δ
unittests	58.68% <ø> (-0.04%)	⬇️

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see 1 file with indirect coverage changes

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