airframe-rpc: #2368 Add RPCContext to access thread-local storage and http request

[xerial]

Closes #2368

[codecov]

Codecov Report

Merging #2369 (db4d95a) into master (7127ac2) will increase coverage by 0.00%.
The diff coverage is 82.14%.

@@           Coverage Diff           @@
##           master    #2369   +/-   ##
=======================================
  Coverage   82.71%   82.72%           
=======================================
  Files         344      347    +3     
  Lines       13128    13154   +26     
  Branches      826      838   +12     
=======================================
+ Hits        10859    10881   +22     
- Misses       2269     2273    +4     

Impacted Files	Coverage Δ
...rc/main/scala/wvlet/airframe/http/GrpcStatus.scala	87.87% <ø> (ø)
...rc/main/scala/wvlet/airframe/http/RPCContext.scala	25.00% <25.00%> (ø)
...vlet/airframe/http/finagle/FinagleRPCContext.scala	66.66% <66.66%> (ø)
...c/main/scala/wvlet/airframe/http/HttpMessage.scala	84.61% <66.66%> (-0.48%)	⬇️
...la/wvlet/airframe/http/finagle/FinagleServer.scala	72.52% <100.00%> (+0.30%)	⬆️
...n/scala/wvlet/airframe/http/grpc/GrpcContext.scala	100.00% <100.00%> (ø)
...n/scala/wvlet/airframe/http/grpc/GrpcService.scala	100.00% <100.00%> (+8.33%)	⬆️
...tp/grpc/internal/GrpcContextTrackInterceptor.scala	100.00% <100.00%> (ø)
...vm/src/main/scala/wvlet/airframe/http/Compat.scala	91.66% <100.00%> (+1.66%)	⬆️
...wvlet/airframe/http/internal/LocalRPCContext.scala	100.00% <100.00%> (ø)
... and 4 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7127ac2...db4d95a. Read the comment docs.

[yuokada]

LGTM

[yuokada]

Could you give a more better name?

[xerial]

I'll rename it to EmptyRPCContext