As external contributor/Solda developer I want to have a clean code base to make contributing easier

[Piiit]

Original source: https://git.ostc-eu.org/groups/oss-compliance/toolchain/-/epics/1#2-aliens4friends

• [x] introduce model classes --> https://git.ostc-eu.org/oss-compliance/toolchain/aliens4friends/-/merge_requests/13
• [x] comments --> minimal... should be improved during other development cycles
• [x] data type hints --> https://git.ostc-eu.org/oss-compliance/toolchain/aliens4friends/-/merge_requests/14
• [x] Alberto checks the MR on ostc gitlab and merges them --> blocked until then