Merge branch 'feature/schema' into 'main'

AKModel/tests/test_json_export.py

AKModel/utils.py

requirements.txt

schemas/ak-export.schema.json

schemas/ak.schema.json

schemas/common/constraints.schema.json

schemas/common/id.schema.json

schemas/common/id_array.schema.json

schemas/participant-export.schema.json

schemas/participant.schema.json

schemas/room-export.schema.json

schemas/room.schema.json

schemas/solver-input-export.schema.json

schemas/solver-input.schema.json

schemas/solver-output.schema.json

schemas/timeslot-export.schema.json

schemas/timeslot.schema.json