feat: split metadata into smal pieces

Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
Co-authored-by: gtema <artem.goncharov@gmail.com>
Co-committed-by: gtema <artem.goncharov@gmail.com>

otc_metadata/tests/test_otc_metadata.py

@@ -45,6 +45,11 @@ class TestOtcMetadata(TestCase):
                 srv["service_category"] in category,
                 f"Category {srv['service_category']} is present",
             )
+        self.assertGreater(
+            len(self.data._service_data["service_categories"]),
+            1,
+            "More then 1 service category",
+        )
 
     def test_doc_contains_required_data(self):
         srv_types = dict()