http (fix): Properly report exception stack traces to server-side logs

[xerial]

The server-side stack trace was not recorded in airframe-http-netty. This PR fixes this.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (76dd486) 82.58% compared to head (4ab696b) 82.62%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3358      +/-   ##
==========================================
+ Coverage   82.58%   82.62%   +0.03%     
==========================================
  Files         355      354       -1     
  Lines       14899    14901       +2     
  Branches     2436     2458      +22     
==========================================
+ Hits        12305    12312       +7     
+ Misses       2594     2589       -5     

Files	Coverage Δ
.../scala/wvlet/airframe/http/netty/NettyServer.scala	88.46% <100.00%> (+0.96%)	⬆️
...rc/main/scala/wvlet/airframe/http/HttpLogger.scala	37.03% <100.00%> (+2.42%)	⬆️
...src/main/scala/wvlet/airframe/http/RPCStatus.scala	86.41% <ø> (ø)
...airframe/http/client/HttpClientLoggingFilter.scala	83.33% <100.00%> (+8.33%)	⬆️
.../scala/wvlet/airframe/http/internal/HttpLogs.scala	91.93% <100.00%> (ø)
.../wvlet/airframe/http/internal/RPCCallContext.scala	100.00% <100.00%> (ø)
...let/airframe/http/internal/RPCResponseFilter.scala	75.00% <83.33%> (+5.76%)	⬆️

... and 3 files with indirect coverage changes

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