moved definitions of data classes into module where used

shared/mongodb/classes/modality_lighting.py

@@ -0,0 +1,13 @@
+"""Definition of ModalityLightingData data model."""
+
+from __future__ import annotations
+
+from .data_model import DataModel
+
+
+class ModalityLightingData(DataModel):
+    """ModalityLightingData data model."""
+
+    high: float
+    medium: float
+    low: float