Draft: Refactor and implement API version of the worker

Closes #17

tests/test_from_sql.py

@@ -15,11 +15,11 @@ from arkindex_worker.cache import (
     CachedTranscription,
     CachedTranscriptionEntity,
 )
-from worker_generic_training_dataset.worker import DatasetExtractor
+from worker_generic_training_dataset.from_sql import DatasetExtractorFromSQL
 
 
 def test_process_split(tmp_path, downloaded_images):
-    worker = DatasetExtractor()
+    worker = DatasetExtractorFromSQL()
     # Parse some arguments
     worker.args = Namespace(database=None)
     worker.data_folder_path = tmp_path