refactor(flow): rework parallel processing of stream elements

[reugn]

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.86%. Comparing base (e4d8dcf) to head (8c5a90d).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #178   +/-   ##
=======================================
  Coverage   99.86%   99.86%           
=======================================
  Files          13       13           
  Lines         748      763   +15     
=======================================
+ Hits          747      762   +15     
  Misses          1        1           

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