refactoring: Extract HTTP request mapper

[xerial]

No description provided.

[codecov]

Codecov Report

Merging #724 into master will not change coverage.
The diff coverage is 96.96%.

@@           Coverage Diff           @@
##           master     #724   +/-   ##
=======================================
  Coverage   83.29%   83.29%           
=======================================
  Files         216      217    +1     
  Lines        8523     8523           
  Branches      609      598   -11     
=======================================
  Hits         7099     7099           
  Misses       1424     1424

Impacted Files	Coverage Δ
...la/wvlet/airframe/http/finagle/FinagleRouter.scala	93.75% <100%> (-0.19%)	⬇️
...ttp/src/main/scala/wvlet/airframe/http/Route.scala	83.33% <100%> (-9.35%)	⬇️
.../scala/wvlet/airframe/http/HttpRequestMapper.scala	96.66% <96.66%> (ø)

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