Adds some GRPC testing utilities

[fedefernandez]

No description provided.

[juanpedromoreno]

👏

[codecov-io]

Codecov Report

Merging #143 into master will decrease coverage by 4.44%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #143      +/-   ##
==========================================
- Coverage   92.66%   88.21%   -4.45%     
==========================================
  Files          23       25       +2     
  Lines         259      280      +21     
  Branches        7        6       -1     
==========================================
+ Hits          240      247       +7     
- Misses         19       33      +14

Impacted Files	Coverage Δ
modules/testing/src/main/scala/servers.scala	100% <100%> (ø)
modules/testing/src/main/scala/methods.scala	100% <100%> (ø)

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