Packaged goods vertical: Adds support for a packagedgoods-v1 product category in addition to other supported product categories

## Feature **Packaged goods vertical**: Adds support for a `packagedgoods-v1` product category in addition to other [supported product categories](https://cloud.google.com/vision/product-search/docs/product-categories). ## Change The following product categories have been updated: * `homegoods-v2` * `apparel-v2` * `toys-v2` The corresponding legacy categories (`homegoods`, `apparel`, and `toys`) are still supported, but the updated categories should be used for new products.