move top-level modules into a real package

chromy/handlers/list_collections.py

@@ -0,0 +1,14 @@
+from argparse import Namespace
+
+from chromy.chroma_functions import list_collections
+from chromy.utilities import print_lines
+
+
+def handle_list_collections(_: Namespace) -> int:
+    collections = list_collections()
+    if not collections:
+        print("No collections found.")
+        return 0
+
+    print_lines(collections)
+    return 0