Add parameter labels

Author: nwoodruff-co

src/policyengine/core/parameter.py

@@ -8,6 +8,7 @@
 class Parameter(BaseModel):
     id: str = Field(default_factory=lambda: str(uuid4()))
     name: str
+    label: str | None = None
     description: str | None = None
     data_type: type | None = None
     tax_benefit_model_version: TaxBenefitModelVersion

src/policyengine/tax_benefit_models/uk/model.py

@@ -83,6 +83,7 @@ def __init__(self, **kwargs: dict):
                 parameter = Parameter(
                     id=self.id + "-" + param_node.name,
                     name=param_node.name,
+                    label=param_node.metadata.get("label", param_node.name),
                     tax_benefit_model_version=self,
                     description=param_node.description,
                     data_type=type(