- updated KPI strategy calculations to correctly support incomplete data
chore:
- renaming data classes for consistency
tests:
- added first basic tests for kpi hierarchy calculation

feature: changed result type of AdapterResult.kt and its implementing classes to the new AdapterResult.kt.
The benefit is that we have one common result type for all adapters which can be either a success or an Error with a given ErrorType to indicate all consumers what went wrong during transformation.

- applied new package structure to kpiCalculator adapter (inserted kpiCalculator module)
- removed hardcoded dispatcher in ToolRunService.kt

- Moved data models for VulnerabilityDto.kt, KpiKind.kt, and RawValueKpiCreateDto.kt to the model's library.
- Created KpiAdapter.kt as an interface for all tool adapter, transforming arbitrary tool results into RawValueKpiCreateDto.kt
- Created a CveAdapter.kt to transform given VulnerabilityDto.kt into RawValueKpiCreateDto.kt.
- Refactored the KpiKind.kt functionality inside the new backend application to retain its previous functionality without the need to move frontend specific code into the library. We now use extension functions in the backend to achieve the same functionality

build: fixed building error for tests in the structure by moving the test files to the appropriate location.