Added snapshottting for the ProcessIndex actor.

[Tim-Linschoten]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1018 (d6bd3d6) into master (f3f37f4) will decrease coverage by 0.22%.
The diff coverage is 58.33%.

@@            Coverage Diff             @@
##           master    #1018      +/-   ##
==========================================
- Coverage   81.43%   81.21%   -0.23%     
==========================================
  Files         115      115              
  Lines        3776     3795      +19     
  Branches      121      130       +9     
==========================================
+ Hits         3075     3082       +7     
- Misses        701      713      +12     

Impacted Files	Coverage Δ
...untime/akka/actor/process_index/ProcessIndex.scala	80.61% <44.44%> (-3.00%)	⬇️
...e/akka/actor/process_index/ProcessIndexProto.scala	97.10% <100.00%> (-2.41%)	⬇️
...r/serialization/BakerTypedProtobufSerializer.scala	100.00% <100.00%> (ø)
...la/com/ing/bakery/baker/InteractionDiscovery.scala	87.50% <0.00%> (+2.08%)	⬆️

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