change reviews example input data source from parquet to csv

Author: vishalbollu

examples/reviews/resources/environments.yaml

@@ -1,10 +1,9 @@
 - kind: environment
   name: dev
   data:
-    type: parquet
-    path: s3a://cortex-examples/reviews.parquet
-    schema:
-      - parquet_column_name: review
-        raw_column_name: review
-      - parquet_column_name: label
-        raw_column_name: label
+    type: csv
+    path: s3a://cortex-examples/reviews.csv
+    csv_config:
+      header: true
+      escape: "\""
+    schema: ["review", "label"]