feat(device): Record inventory date and show as part of details

inventory date is added when an inventory is processed

!8 #2

app/itam/migrations/0007_device_inventorydate.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.0.6 on 2024-05-20 09:47
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('itam', '0006_alter_devicesoftware_options_and_more'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='device',
+            name='inventorydate',
+            field=models.DateTimeField(blank=True, null=True, verbose_name='Last Inventory Date'),
+        ),
+    ]