feat(devops): Add feature flag public serializer

ref: #673 #663

app/devops/serializers/public_feature_flag.py

@@ -0,0 +1,47 @@
+from rest_framework import serializers
+
+from devops.models.feature_flag import FeatureFlag
+
+
+
+class ModelSerializer(
+    serializers.ModelSerializer,
+):
+
+
+    class Meta:
+
+        model = FeatureFlag
+
+        fields =  [
+            'id',
+            'name',
+            'description',
+            'enabled',
+            'created',
+            'modified',
+        ]
+
+        read_only_fields = [
+            'id',
+            'name',
+            'description',
+            'enabled',
+            'created',
+            'modified',
+        ]
+
+
+    def to_representation(self, instance):
+
+        key_id = str(instance.created.year) + '-' + str(f'{instance.id:05}')
+
+        return {
+            key_id : {
+                "name": instance.name,
+                "description": instance.description,
+                "enabled": instance.enabled,
+                "created": instance.created,
+                "modeified": instance.modified
+            }
+        }