dahlbaek

SNOW-721174: Support `COPY INTO <location>` with storage integration and gcs bucket

1

## What is the current behavior? The `COPY INTO ` statement support gcs buckets, but there is no GCSBucket ClauseElement in https://github.com/snowflakedb/snowflake-sqlalchemy/blob/a84fa77ae4387ed60db036db61dc7d8f82849a98/src/snowflake/sqlalchemy/custom_commands.py. Similarly, the statement supports using a STORAGE_INTEGRATION option,...