feat(itam): History Model for Device Operating System added

ref: #605 #618

app/core/models/model_history.py

@@ -87,6 +87,7 @@ class ModelHistory(
     child_history_models = [
         'configgrouphostshistory',
         'configgroupsoftwarehistory',
+        'deviceoperatingsystemhistory',
         'devicesoftwarehistory'
     ]
     """Child History Models

app/itam/models/device_operating_system_history.py

@@ -0,0 +1,49 @@
+from django.db import models
+
+from itam.models.device import DeviceOperatingSystem
+from itam.models.device_history import (
+    DeviceHistory
+)
+
+
+
+class DeviceOperatingSystemHistory(
+    DeviceHistory
+):
+
+
+    class Meta:
+
+        db_table = 'itam_deviceoperatingsystem_history'
+
+        ordering = DeviceHistory._meta.ordering
+
+        verbose_name = 'Device Operating System History'
+
+        verbose_name_plural = 'Device Operating System History'
+
+
+    child_model = models.ForeignKey(
+        DeviceOperatingSystem,
+        blank = False,
+        help_text = 'Model this note belongs to',
+        null = False,
+        on_delete = models.CASCADE,
+        related_name = 'history',
+        verbose_name = 'Model',
+    )
+
+    table_fields: list = []
+
+    page_layout: dict = []
+
+
+    def get_serialized_child_model(self, serializer_context):
+
+        model = None
+
+        from itam.serializers.operating_system import OperatingSystemBaseSerializer
+
+        model = OperatingSystemBaseSerializer(self.child_model.operating_system_version.operating_system, context = serializer_context)
+
+        return model