refactor: rename Response to ReqResponse

[soulbird]

We will add response.go and Response interface to support response phase

[codecov-commenter]

Codecov Report

Merging #88 (fb1cec7) into master (413b903) will decrease coverage by 1.74%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
- Coverage   81.23%   79.49%   -1.75%     
==========================================
  Files          11       12       +1     
  Lines         746      746              
==========================================
- Hits          606      593      -13     
- Misses        102      114      +12     
- Partials       38       39       +1     

Impacted Files	Coverage Δ
internal/http/request.go	93.36% <ø> (-0.14%)	⬇️
internal/http/header.go	100.00% <100.00%> (ø)
internal/http/req-response.go	100.00% <100.00%> (ø)
internal/plugin/plugin.go	78.68% <100.00%> (ø)
internal/server/server.go	56.91% <0.00%> (-10.57%)	⬇️

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[spacewander]

Please make the CI pass, thanks!