feat: expose modal location

Author: PProfizi

src/ansys/dpf/core/common.py

@@ -69,6 +69,9 @@ class locations:
 
     elemental_and_faces = "ElementalAndFaces"
         data available in elements and faces of the model
+
+    modal = "Modal"
+        relative to modes
     """
 
     none = "none"
@@ -100,6 +103,9 @@ class locations:
     # data available in elements and faces of the model
     elemental_and_faces = "ElementalAndFaces"
 
+    # data available at modes
+    modal = "Modal"
+
 
 def _camel_to_snake_case(name):
     return re.sub(r"(?<!^)(?=[A-Z])", "_", name).lower()