2755 Add ability to extend HostNode, NetworkNode, Service and Application outside PrimAITE.

src/primaite/config/load.py

@@ -59,3 +59,17 @@ def data_manipulation_marl_config_path() -> Path:
         _LOGGER.error(msg)
         raise FileNotFoundError(msg)
     return path
+
+def get_extended_config_path() -> Path:
+    """
+    Get the path to an 'extended' example config that contains nodes using the extension framework
+
+    :return: Path to the extended example config
+    :rtype: Path
+    """
+    path = _EXAMPLE_CFG / "extended_config.yaml"
+    if not path.exists():
+        msg = f"Example config does not exist: {path}. Have you run `primaite setup`?"
+        _LOGGER.error(msg)
+        raise FileNotFoundError(msg)
+    return path