Develop py update schema (#37)

* feature: implement endpoints with multi-level response models
* refactor: move `/health` and `/config` endpoints to system module, remove example from base schemas
* refactor: remove unused get_standard_response_model()

runtime/datamate-python/app/module/system/schema/__init__.py

@@ -0,0 +1,4 @@
+from .config import ConfigResponse
+from .health import HealthResponse
+    
+__all__ = ["ConfigResponse", "HealthResponse"]