docs: Add CUBESQL_STREAM_MODE, update the default for CUBESQL_SQL_PUSH_DOWN

Author: igorlukanin

docs/pages/reference/configuration/environment-variables.mdx

@@ -977,7 +977,7 @@ If `true`, enables query pushdown in the [SQL API][ref-sql-api].
 
 | Possible Values | Default in Development | Default in Production |
 | --------------- | ---------------------- | --------------------- |
-| `true`, `false` | `false`                | `false`               |
+| `true`, `false` | `true`                | `true`               |
 
 <InfoBox>
 
@@ -986,6 +986,14 @@ Query pushdown in the SQL API is available in public preview.
 
 </InfoBox>
 
+## `CUBESQL_STREAM_MODE`
+
+If `true`, enables the [streaming mode][ref-sql-api-streaming] in the [SQL API][ref-sql-api].
+
+| Possible Values | Default in Development | Default in Production |
+| --------------- | ---------------------- | --------------------- |
+| `true`, `false` | `false`                | `false`               |
+
 ## `CUBESQL_SQL_NO_IMPLICIT_ORDER`
 
 If `true`, prevents adding implicit [default `ORDER BY`
@@ -1468,4 +1476,5 @@ The port for a Cube deployment to listen to API connections on.
   https://docs.snowflake.com/en/user-guide/warehouses.html
 [wiki-tz-database]: https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
 [ref-sql-api]: /product/apis-integrations/sql-api
+[ref-sql-api-streaming]: /product/apis-integrations/sql-api#streaming
 [ref-row-limit]: /product/apis-integrations/queries#row-limit