[1/n] click-ify - add entrypoint for click script and add

1_dump_listings command

run via:
poetry run python main.py --step dump_listings

crawler/main.py

@@ -0,0 +1,26 @@
+import click
+import importlib
+
+dump_listings_module = importlib.import_module('1_dump_listings')
+
+steps_to_handlers = {
+    'dump_listings': dump_listings_module.dump_listings,
+}
+
+
+@click.command()
+@click.option(
+    '--step',
+    default=[],
+    help='Scraping step to run',
+    multiple=True,
+    type=click.Choice(steps_to_handlers.keys())
+)
+def main(step: list[str]):
+    for s in step:
+        click.echo(f'Calling handler for step: {s}')
+        steps_to_handlers[s]()
+
+
+if __name__ == '__main__':
+    main()