Makes the client extends the service

[fedefernandez]

Go from this

To this

The problems:

• We can't have nonrequest methods. Not a big deal, I haven't seen rpc services with custom methods.
• The autogenerated clients are not AbstractStub from the user perspective. They can always make a casting. If this can be a problem, one alternative could be this [WIP] - Approach II #492

Thoughts?

[juanpedromoreno]

This looks great to me despite the drawbacks ;) , since none of them would suppose a big stopper for the users.

Thanks @fedefernandez !

[codecov]

Codecov Report

Merging #493 into master will decrease coverage by 10.09%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #493      +/-   ##
==========================================
- Coverage   74.97%   64.87%   -10.1%     
==========================================
  Files          61       61              
  Lines         855      988     +133     
  Branches       17       17              
==========================================
  Hits          641      641              
- Misses        214      347     +133

Impacted Files	Coverage Δ
modules/client-netty/src/main/scala/netty.scala	0% <0%> (ø)	⬆️
...idlgen/core/src/main/scala/SrcGenApplication.scala	0% <0%> (ø)	⬆️

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[franciscodr]

Nice to get rid of all those false positives in IntelliJ :)