docs: Update Snowflake docs with permissions (#9608)

* Update Snowflake docs with permissions

* Update docs/pages/product/configuration/data-sources/snowflake.mdx

---------

Co-authored-by: Igor Lukanin <mail+github@igor.lukanin.name>

Author: tonykau1

docs/pages/product/configuration/data-sources/snowflake.mdx

@@ -4,6 +4,21 @@
 
 ## Prerequisites
 
+<InfoBox>
+
+In order to connect Cube to Snowflake, you need to grant certain permissions to the Snowflake role
+used by Cube. Cube requires the role to have `USAGE` on databases and schemas
+and `SELECT` on tables. An example configuration:
+```
+GRANT USAGE ON DATABASE ABC TO ROLE XYZ;
+GRANT USAGE ON ALL SCHEMAS IN DATABASE ABC TO ROLE XYZ;
+GRANT USAGE ON FUTURE SCHEMAS IN DATABASE ABC TO ROLE XYZ;
+GRANT SELECT ON ALL TABLES IN DATABASE ABC TO ROLE XYZ;
+GRANT SELECT ON FUTURE TABLES IN DATABASE ABC TO ROLE XYZ;
+```
+
+</InfoBox>
+
 - [Account/Server URL][snowflake-docs-account-id] for Snowflake.
 - User name and password or an RSA private key for the Snowflake account.
 - Optionally, the warehouse name, the user role, and the database name.
@@ -200,4 +215,4 @@ connections are made over HTTPS.
 [snowflake-format-2]: https://docs.snowflake.com/en/user-guide/admin-account-identifier#format-2-account-locator-in-a-region
 [snowflake-docs-azure]: https://docs.snowflake.com/en/user-guide/data-load-azure-config#option-1-configuring-a-snowflake-storage-integration
 [azure-bs-docs-get-key]: https://docs.microsoft.com/en-us/azure/storage/common/storage-account-keys-manage?toc=%2Fazure%2Fstorage%2Fblobs%2Ftoc.json&tabs=azure-portal#view-account-access-keys
-[link-snowflake-quoted-identifiers]: https://docs.snowflake.com/en/sql-reference/identifiers-syntax#double-quoted-identifiers
+[link-snowflake-quoted-identifiers]: https://docs.snowflake.com/en/sql-reference/identifiers-syntax#double-quoted-identifiers