Switch SDK generation from OpenAPI schema to public resources

[malessani]

In order to support new API resources we decided to move the generation from OpenAPI schema to the public resources endpoint: https://core.commercelayer.io/api/public/resources

[pviti]

🎉 This issue has been resolved in version 8.0.0-beta.7 🎉

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

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