Add a tool script for initiating dandi:files extractors

On processed repos

tools/run_dandi_files_extractor.py

@@ -0,0 +1,19 @@
+# This script initiates Celery tasks to run the `dandi:files` on each processed repo.
+
+from sqlalchemy import select
+
+from datalad_registry import create_app
+from datalad_registry.models import RepoUrl, db
+from datalad_registry.tasks import extract_ds_meta
+
+flask_app = create_app()
+
+with flask_app.app_context():
+
+    # Get the IDs of the processed repo URLs
+    processed_url_ids = (
+        db.session.execute(select(RepoUrl.id).filter(RepoUrl.processed)).scalars().all()
+    )
+
+    for url_id in processed_url_ids:
+        extract_ds_meta.delay(url_id, "dandi:files")