Added storage to events

[umbreak]

Fixes BlueBrain/nexus#485

[codecov-io]

Codecov Report

Merging #622 into master will decrease coverage by 0.68%.
The diff coverage is 40.86%.

@@            Coverage Diff             @@
##           master     #622      +/-   ##
==========================================
- Coverage   84.26%   83.57%   -0.69%     
==========================================
  Files          82       82              
  Lines        1741     1760      +19     
  Branches       28       36       +8     
==========================================
+ Hits         1467     1471       +4     
- Misses        274      289      +15

Impacted Files	Coverage Δ
.../epfl/bluebrain/nexus/kg/routes/SchemaRoutes.scala	100% <ø> (ø)	⬆️
...ch/epfl/bluebrain/nexus/kg/resources/Command.scala	100% <ø> (ø)	⬆️
...a/ch/epfl/bluebrain/nexus/kg/resources/State.scala	66.66% <ø> (ø)	⬆️
...brain/nexus/kg/storage/FileStorageOperations.scala	0% <0%> (ø)
.../ch/epfl/bluebrain/nexus/kg/config/AppConfig.scala	95.08% <100%> (+0.25%)	⬆️
...fl/bluebrain/nexus/kg/storage/StorageEncoder.scala	100% <100%> (ø)	⬆️
...ch/epfl/bluebrain/nexus/kg/config/Vocabulary.scala	100% <100%> (ø)	⬆️
.../epfl/bluebrain/nexus/kg/resources/ResourceF.scala	100% <100%> (ø)	⬆️
...epfl/bluebrain/nexus/kg/resources/ProjectRef.scala	100% <100%> (ø)	⬆️
...fl/bluebrain/nexus/kg/serializers/Serializer.scala	100% <100%> (ø)	⬆️
... and 7 more

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