You can now optionally specify which model to use by passing an endpoint

## Change Change You can now optionally specify which model to use by passing an endpoint argument to the[AI.IF](https://cloud.google.com/bigquery/docs/reference/standard-sql/bigqueryml-syntax-ai-if),[AI.SCORE](https://cloud.google.com/bigquery/docs/reference/standard-sql/bigqueryml-syntax-ai-score), and[AI.CLASSIFY](https://cloud.google.com/bigquery/docs/reference/standard-sql/bigqueryml-syntax-ai-classify)functions.