Add/Update Models

[bendvc]

A partner has run into an issue where the variation attribute values doesn't have the 'image' nor 'image_swatch' properties. This PR adds the parsing of these values. As well as a few other properties.

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update

Changes

• Added image and image_swatch properties on the VariationAttributeValue model
• Added represented_product and represented_products on the ProductSearchHit model
• Created ProductRef model

How to test this PR?

You can test this PR by following the below steps:

1. Clone and npm ci the mobify-platform-sdks project
2. Clone this repo (particularly this branch)
3. Link these projects by first installing and building the commercecloud-ocapi-client then running npm link
4. In the packages/commerce-integrations folder of the sdks project run npm link ../../../commercecloud-ocapi-client
5. Once these are linked you can run the explore project packages/explorer and previewing here
6. Search for some products and you should now see the correct content in the models.

Checklist:

• [ ] My code follows the style guidelines of this project (npm run lint)
• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation (README.md and CHANGELOG.md)
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes (npm test)