feat: add iceberg with spark

Signed-off-by: kjuulh <contact@kjuulh.io>

templates/create_mvs.sql

@@ -11,3 +11,12 @@ where
     and impression_timestamp + interval '1' minute >= click_timestamp
 group by
     ad_id;
+
+create materialized view clicks as
+select
+    user_id,
+    ad_id,
+    click_timestamp,
+    impression_timestamp
+from
+    ad_source;