refactor: reduce default column limit

Reduces the default number of columns allowed per-table, from 1,000 to
200.

iox_catalog/migrations/20221014122742_lower-default-per-table-column-limit.sql

@@ -0,0 +1,7 @@
+-- Lower the defualt per-table column limit.
+--
+-- https://github.com/influxdata/influxdb_iox/issues/5858
+ALTER TABLE
+    namespace ALTER max_columns_per_table
+SET
+    DEFAULT 200;