httpx: Request 和 Response 初步设计

[flycash]

在使用原生的 http 包的时候，充斥着大量的错误处理。这里我将整个过程简化了，只有在发起最终调用的时候，才会返回 error。

所谓的最终调用，就是指真正尝试解析 response 的时候，才会返回 error。在这之前，可以保持丝滑的链式调用。

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (14dba09) 95.77% compared to head (1932a13) 95.64%.

Files	Patch %	Lines
net/httpx/response.go	50.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #236      +/-   ##
==========================================
- Coverage   95.77%   95.64%   -0.14%     
==========================================
  Files          62       65       +3     
  Lines        3265     3328      +63     
==========================================
+ Hits         3127     3183      +56     
- Misses        106      112       +6     
- Partials       32       33       +1     

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