add top_class_id to kwargs

- add top_class_id to kwargs, which is needed in _ChEBIDataExtractor class to create another chebi class object related to train version

self._chebi_version_train_obj = self.__class__(single_class=self.single_class, **_init_kwargs,)

Author: aditya0by0

chebai/preprocessing/datasets/chebi.py

@@ -736,6 +736,9 @@ def __init__(self, top_class_id: int, **kwargs):
             top_class_id (int): The ID of the top class from which to extract subclasses.
             **kwargs: Additional keyword arguments passed to the superclass initializer.
         """
+        if "top_class_id" not in kwargs:
+            kwargs["top_class_id"] = top_class_id
+
         self.top_class_id: int = top_class_id
         super().__init__(**kwargs)