refactor: standarize API Client

[sethidden]

🔗 Linked issue

IN-4072

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation, readme or JSDoc annotations)
• [ ] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [ ] 👌 Enhancement (improving an existing functionality like performance)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• [x] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Standarizes Magento API Client by changing the Endpoints interface, adding ApiMethods interface and refactoring the api methods to be async functions.

📝 Checklist

• [x] I have linked an issue or discussion.
• [x] I have updated the documentation accordingly.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: a948cf6475dd939c38ae68946a8838dcf5c1209c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | --------------------------- | ----- | | @vue-storefront/magento-api | Major |

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