CATALOG-9786: [update] Brands: REST Catalog (#337)

# [CATALOG-9786]

## What changed?
* Add swagger file for V2 Brands
* Update swagger file for V3 Brands

## Release notes draft
* Revert this PR



[CATALOG-9786]:
https://bigcommercecloud.atlassian.net/browse/CATALOG-9786?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

Author: NataliiaNefodova