netty (fix): Fix async REST response handling (Scala Future, error Rx)

[xerial]

• Provide a thread manager in NettyServerConfig
• Fix async request handling to properly catch the last response
• Fix a blocking bug when REST API returns Future[_] response type

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (1c91d6a) 82.55% compared to head (3bbea02) 82.56%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3351      +/-   ##
==========================================
+ Coverage   82.55%   82.56%   +0.01%     
==========================================
  Files         355      355              
  Lines       14892    14896       +4     
  Branches     2473     2446      -27     
==========================================
+ Hits        12294    12299       +5     
+ Misses       2598     2597       -1     

Files	Coverage Δ
...la/wvlet/airframe/http/finagle/FinagleFilter.scala	94.44% <100.00%> (+0.32%)	⬆️
...la/wvlet/airframe/http/finagle/FinagleServer.scala	70.10% <ø> (ø)
.../scala/wvlet/airframe/http/netty/NettyServer.scala	87.50% <100.00%> (+0.15%)	⬆️
...t/airframe/http/client/JavaHttpClientChannel.scala	93.02% <ø> (ø)
...ame/http/router/HttpEndpointExecutionContext.scala	100.00% <100.00%> (ø)
...t/airframe/http/router/HttpRequestDispatcher.scala	89.18% <100.00%> (ø)
...scala/wvlet/airframe/http/client/AsyncClient.scala	94.87% <100.00%> (-0.13%)	⬇️
.../wvlet/airframe/http/client/HttpClientConfig.scala	60.00% <100.00%> (+1.37%)	⬆️
.../scala/wvlet/airframe/http/client/SyncClient.scala	97.29% <100.00%> (-0.08%)	⬇️
...scala/wvlet/airframe/http/client/HttpClients.scala	84.33% <50.00%> (ø)
... and 1 more

... and 2 files with indirect coverage changes

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