feat: support process alias as request reference

[zmstone]

Support process alias as request reference so the Kafka reply can be delivered to a different process than the one which created the request.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.34%. Comparing base (a3babac) to head (c97d891).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #146      +/-   ##
==========================================
+ Coverage   80.32%   80.34%   +0.02%     
==========================================
  Files          21       21              
  Lines        1733     1735       +2     
==========================================
+ Hits         1392     1394       +2     
  Misses        341      341              

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