grpc-gateway Demo

[juanpedromoreno]

This PR ships a new demo showing how to deploy http gateway services that are able to call RPC services deployed with grpc.

It's based on https://github.com/grpc-ecosystem/grpc-gateway . Hence, it uses some go lang to set up the reverse proxy service.

On the other side, since now we have two rpc services, package organization has been changed.

[codecov-io]

Codecov Report

Merging #7 into master will not change coverage.
The diff coverage is 0%.

@@         Coverage Diff          @@
##           master    #7   +/-   ##
====================================
  Coverage       0%    0%           
====================================
  Files           6    11    +5     
  Lines         102   121   +19     
  Branches        3     4    +1     
====================================
- Misses        102   121   +19

Impacted Files	Coverage Δ
...mo/src/main/scala/greeting/GreetingClientApp.scala	0% <ø> (ø)
...mo/src/main/scala/greeting/GreetingServerApp.scala	0% <ø> (ø)
demo/src/main/scala/package.scala	0% <ø> (ø)	⬆️
demo/src/main/scala/greeting/GreetingClient.scala	0% <ø> (ø)
demo/src/main/scala/user/UserClient.scala	0% <0%> (ø)
demo/src/main/scala/user/UserClientApp.scala	0% <0%> (ø)
demo/src/main/scala/user/UserServerApp.scala	0% <0%> (ø)
demo/src/main/scala/user/UserService.scala	0% <0%> (ø)
demo/src/main/scala/greeting/GreetingService.scala	0% <0%> (ø)
demo/src/main/scala/user/package.scala	0% <0%> (ø)
... and 5 more

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