Fix starting index for batch processing (#80)

Author: nabinchha

src/data_designer/engine/dataset_builders/column_wise_builder.py

@@ -88,8 +88,8 @@ def build(
         start_time = time.perf_counter()
 
         self.batch_manager.start(num_records=num_records, buffer_size=buffer_size)
-        for batch_idx in range(1, self.batch_manager.num_batches + 1):
-            logger.info(f"⏳ Processing batch {batch_idx} of {self.batch_manager.num_batches}")
+        for batch_idx in range(self.batch_manager.num_batches):
+            logger.info(f"⏳ Processing batch {batch_idx + 1} of {self.batch_manager.num_batches}")
             self._run_batch(generators)
             df_batch = self._run_processors(
                 stage=BuildStage.POST_BATCH,