test: add skeleton tests/test_storage_interfaces.py

Author: DiogoRibeiro7

tests/test_storage_interfaces.py

@@ -0,0 +1,9 @@
+import importlib
+
+
+def test_import_storage_interfaces():
+    mod = importlib.import_module("llm_observability_analytics.storage.interfaces")
+    assert mod is not None
+
+
+# TODO: add in-memory storage double tests