Add optional callbacks in AutoParititon Mode

[Saheb]

No description provided.

[simonsouter]

Also Fixes (#125)

[codecov-io]

Codecov Report

Merging #124 into master will decrease coverage by 0.1%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #124      +/-   ##
==========================================
- Coverage   64.07%   63.96%   -0.11%     
==========================================
  Files          16       16              
  Lines         515      519       +4     
  Branches       30       31       +1     
==========================================
+ Hits          330      332       +2     
- Misses        185      187       +2

Impacted Files	Coverage Δ
...cala/cakesolutions.kafka/testkit/KafkaServer.scala	89.23% <100%> (ø)	⬆️
.../cakesolutions/kafka/akka/KafkaConsumerActor.scala	56.8% <100%> (-0.47%)	⬇️
...ala/cakesolutions/kafka/akka/TrackPartitions.scala	75.47% <75%> (-0.04%)	⬇️

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