fix(Python): add missing metadata members to Mesh, PointSet

Author: thewtex

packages/core/python/itkwasm/itkwasm/mesh.py

@@ -46,6 +46,8 @@ class Mesh:
     numberOfCellPixels: int = 0
     cellData: Optional[ArrayLike] = None
 
+    metadata: Dict = field(default_factory=dict)
+
     def __post_init__(self):
         if isinstance(self.meshType, dict):
             self.meshType = MeshType(**self.meshType)

packages/core/python/itkwasm/itkwasm/pointset.py

@@ -34,6 +34,8 @@ class PointSet:
     numberOfPointPixels: int = 0
     pointData: Optional[ArrayLike] = None
 
+    metadata: Dict = field(default_factory=dict)
+
     def __post_init__(self):
         if isinstance(self.pointSetType, dict):
             self.pointSetType = PointSetType(**self.pointSetType)

packages/core/python/itkwasm/itkwasm/transform.py

@@ -58,7 +58,7 @@ class Transform:
     fixedParameters: Optional[ArrayLike] = None
     parameters: Optional[ArrayLike] = None
 
-    metadata: dict = field(default_factory=dict)
+    metadata: Dict = field(default_factory=dict)
 
     def __post_init__(self):
         if isinstance(self.transformType, dict):