Add inclusive / exclusive metadata tag to scale parameters

Fixes #221

changelog_entry.yaml

@@ -0,0 +1,4 @@
+- bump: minor
+  changes:
+    added:
+    - Add inclusive / exclusive metadata tag to parameters.

policyengine_core/data_structures/parameter_metadata.py

@@ -65,6 +65,9 @@ class ParameterMetadata:
     unit: str
     """The real-world meaning of a particular value."""
 
+    inclusive: bool
+    """Whether the value is inclusive or exclusive of the upper bound."""
+
     uprating: Union[UpratingIndex, UpratingSchema]
     """The schema for uprating this parameter.
 

policyengine_core/data_structures/parameter_node_metadata.py

@@ -42,5 +42,8 @@ class ParameterNodeMetadata:
     
     """
 
+    inclusive: bool
+    """Whether the value is inclusive or exclusive of the upper bound."""
+
     propagate_metadata_to_children: bool
     """Whether to propagate metadata to children of this node. This excludes `breakdown`."""