replace argparse.Namespace plumbing with typed command inputs

chromy/handlers/list_collections.py

@@ -1,10 +1,11 @@
-from argparse import Namespace
+from __future__ import annotations
 
+from chromy.command_inputs import ListCollectionsInput
 from chromy.chroma_functions import list_collections
 from chromy.utilities import print_lines
 
 
-def handle_list_collections(_: Namespace) -> int:
+def handle_list_collections(_: ListCollectionsInput) -> int:
     collections = list_collections()
     if not collections:
         print("No collections found.")