[#72] Apply stopOnError to Producer send Exceptions

[Sage-Pierce]

A pass at implementing what is mentioned in #72

[codecov-io]

Codecov Report

Merging #73 into master will increase coverage by 0.53%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #73      +/-   ##
============================================
+ Coverage     80.82%   81.35%   +0.53%     
  Complexity      228      228              
============================================
  Files            18       18              
  Lines          1121     1121              
  Branches        113      113              
============================================
+ Hits            906      912       +6     
+ Misses          177      171       -6     
  Partials         38       38

Impacted Files	Coverage Δ	Complexity Δ
...tor/kafka/sender/internals/DefaultKafkaSender.java	90.7% <100%> (+1.32%)	32 <0> (ø)	⬇️
...kafka/receiver/internals/DefaultKafkaReceiver.java	88.96% <0%> (+0.68%)	59% <0%> (ø)	⬇️

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[smaldini]

Simple and efficient, thanks a lot!