airframe-grpc: Propagate RPCException to clients

[xerial]

Embed RPCException to gRPC trailer so that the client can receive detailed RPCException.

[codecov]

Codecov Report

Merging #2139 (7f5cbc4) into master (27cb12c) will increase coverage by 0.16%.
The diff coverage is 87.25%.

@@            Coverage Diff             @@
##           master    #2139      +/-   ##
==========================================
+ Coverage   82.50%   82.67%   +0.16%     
==========================================
  Files         301      305       +4     
  Lines       11837    12057     +220     
  Branches      759      739      -20     
==========================================
+ Hits         9766     9968     +202     
- Misses       2071     2089      +18     

Impacted Files	Coverage Δ
...rframe/http/grpc/internal/GrpcRequestHandler.scala	74.40% <ø> (ø)
.../grpc/internal/GrpcResponseHeaderInterceptor.scala	100.00% <ø> (ø)
...http/src/main/scala/wvlet/airframe/http/Http.scala	75.47% <ø> (ø)
...rc/main/scala/wvlet/airframe/http/HttpStatus.scala	91.20% <0.00%> (-8.80%)	⬇️
.../main/scala/wvlet/airframe/msgpack/spi/Value.scala	82.39% <ø> (ø)
...let/airframe/surface/reflect/ReflectTypeUtil.scala	84.44% <ø> (ø)
...c/main/scala/wvlet/airframe/http/HttpMessage.scala	80.35% <66.66%> (-0.38%)	⬇️
...src/main/scala/wvlet/airframe/http/RPCStatus.scala	85.24% <85.24%> (ø)
...rc/main/scala/wvlet/airframe/http/GrpcStatus.scala	87.87% <87.87%> (ø)
...in/scala/wvlet/airframe/codec/PrimitiveCodec.scala	84.76% <92.85%> (-0.19%)	⬇️
... and 8 more

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