PlantUML generator: first implementation for sequence diagrams for use case interactions

[codecov[bot]]

Codecov Report

Merging #339 (14b633f) into master (e40a4f1) will increase coverage by 0.0%. The diff coverage is 91.8%.

@@           Coverage Diff            @@
##             master    #339   +/-   ##
========================================
  Coverage      92.9%   93.0%           
- Complexity     2325    2343   +18     
========================================
  Files           203     204    +1     
  Lines          6263    6311   +48     
  Branches        840     844    +4     
========================================
+ Hits           5824    5872   +48     
+ Misses          216     214    -2     
- Partials        223     225    +2     

Impacted Files	Coverage Δ
...contextmapper/dsl/generator/PlantUMLGenerator.java	98.6% <83.3%> (+4.3%)	:arrow_up:
...tUMLUseCaseInteractionsSequenceDiagramCreator.java	92.8% <92.8%> (ø)
...plantuml/PlantUMLSubdomainClassDiagramCreator.java	100.0% <100.0%> (ø)