Set request attrs for payload transfer and proxy conn setup timings

[nicmunroe]

No description provided.

[codecov-io]

Codecov Report

Merging #94 into master will increase coverage by 0.09%.
The diff coverage is 92.85%.

@@             Coverage Diff              @@
##             master      #94      +/-   ##
============================================
+ Coverage     91.34%   91.43%   +0.09%     
- Complexity     2108     2118      +10     
============================================
  Files           148      148              
  Lines          6109     6132      +23     
  Branches        799      803       +4     
============================================
+ Hits           5580     5607      +27     
+ Misses          356      353       -3     
+ Partials        173      172       -1

Impacted Files	Coverage Δ	Complexity Δ
.../riposte/server/handler/AccessLogStartHandler.java	100% <100%> (ø)	14 <3> (+5)	⬆️
...r/handler/ProxyRouterEndpointExecutionHandler.java	61.25% <100%> (+0.12%)	27 <1> (+1)	⬆️
...ient/asynchttp/netty/StreamingAsyncHttpClient.java	76.27% <80%> (+0.74%)	49 <0> (+3)	⬆️
.../com/nike/riposte/server/logging/AccessLogger.java	96.29% <0%> (+1.48%)	48% <0%> (+1%)	⬆️

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