add initial version of kpi calculation and storage

src/main/kotlin/de/fraunhofer/iem/dataprovider/kpi/KPIDto.kt

...de/fraunhofer/iem/dataprovider/kpi/KPIHierarchyEdgeDto.kt

...in/kotlin/de/fraunhofer/iem/dataprovider/kpi/model/KPI.kt

...fraunhofer/iem/dataprovider/kpi/model/KPIHierarchyEdge.kt

...dataprovider/kpi/repository/KPIHierarchyEdgeRepository.kt

...aunhofer/iem/dataprovider/kpi/repository/KPIRepository.kt

.../de/fraunhofer/iem/dataprovider/kpi/service/KPIService.kt

...rovider/kpi/strategy/AggregationKPICalculationStrategy.kt

...r/iem/dataprovider/kpi/strategy/KPICalculationStrategy.kt

.../dataprovider/kpi/strategy/RatioKPICalculationStrategy.kt

...taprovider/kpi/strategy/RawValueKPICalculationStrategy.kt

...de/fraunhofer/iem/dataprovider/taskManager/TaskManager.kt

...de/fraunhofer/iem/dataprovider/taskManager/model/Event.kt

...ataprovider/taskManager/tasks/GetRepositoryDetailsTask.kt

...unhofer/iem/dataprovider/taskManager/tasks/MetricsTask.kt

...r/iem/dataprovider/toolRun/RepositoryDetailsRepository.kt

.../de/fraunhofer/iem/dataprovider/toolRun/ToolRunService.kt