airframe-http: Add RPC call logging

[xerial]

No description provided.

[codecov]

Codecov Report

Merging #1076 into master will decrease coverage by 0.00%.
The diff coverage is 76.47%.

@@            Coverage Diff             @@
##           master    #1076      +/-   ##
==========================================
- Coverage   82.31%   82.31%   -0.01%     
==========================================
  Files         270      270              
  Lines       10258    10274      +16     
  Branches      670      666       -4     
==========================================
+ Hits         8444     8457      +13     
- Misses       1814     1817       +3     

Impacted Files	Coverage Δ
...rame/http/finagle/filter/HttpAccessLogWriter.scala	94.11% <ø> (ø)
...wvlet/airframe/http/router/HttpRequestMapper.scala	93.93% <ø> (ø)
...c/main/scala/wvlet/airframe/http/HttpContext.scala	73.33% <40.00%> (-16.67%)	⬇️
...rame/http/finagle/filter/HttpAccessLogFilter.scala	77.17% <90.90%> (+2.78%)	⬆️
.../main/scala/wvlet/airframe/http/router/Route.scala	87.50% <100.00%> (+0.83%)	⬆️

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[takezoe]

Looks very good!