fixed imports & removed splitter.py since the functionality had been migrated to cd.Dataset

Author: ymahlich

coderdata/__init__.py

@@ -1,8 +1,9 @@
 from .download.downloader import download
-from .split.splitter import train_test_validate
 from .dataset.dataset import (
     Dataset,
     load,
+    format,
+    train_test_validate
 )
 
 # '_version.py' will be generated by hatchling once the switch away from

coderdata/dataset/__init__.py

@@ -1,2 +1,4 @@
 from .dataset import Dataset
-from .dataset import load
+from .dataset import load
+from .dataset import format
+from .dataset import train_test_validate