feature: #2151 Feature/mvi pattern (#2177)

* #2151 add module and pom.xml

* #2151 add Calculator Actions

* #2151 add remaining mvi pattern classes (actions already implemented)

* #2151 add Main and unit tests

* add README.md and class diagrams

* #2151 add module and pom.xml

* #2151 add Calculator Actions

* #2151 add remaining mvi pattern classes (actions already implemented)

* #2151 add Main and unit tests

* add README.md and class diagrams

* fixes for lint errors

* #2151 add module and pom.xml

* #2151 add Calculator Actions

* #2151 add remaining mvi pattern classes (actions already implemented)

* #2151 add Main and unit tests

* add README.md and class diagrams

* fixes for lint errors

* use Lombok @Data decorator and decouple View from ViewModel

* add comments and documentation

* fix checkstyle, the smart switch syntax was breaking checkstyle, so I had to change it back