[2/n] click-ify - add 2_dump_detail command

run with
poetry run python main.py --step dump_detail

crawler/main.py

@@ -2,9 +2,11 @@ import click
 import importlib
 
 dump_listings_module = importlib.import_module('1_dump_listings')
+dump_detail_module = importlib.import_module('2_dump_detail')
 
 steps_to_handlers = {
     'dump_listings': dump_listings_module.dump_listings,
+    'dump_detail': dump_detail_module.dump_detail,
 }