Feat: new suggestions endpoint

[ahuininga-orisha]

📝 Description

This PR implements support for the new Tweakwise Suggestions endpoint.

Note: This PR depends on EmicoEcommerce/Magento2Tweakwise/pull/350, which must be merged/available for this functionality to work correctly.

⚠️ Upgrade Guide

If you have a custom override for quicksearch.phtml, you must perform one of the following actions to avoid breaking the search functionality:

1. To use the new functionality: Copy the changes from the base quicksearch.phtml into your custom override file.
2. To retain legacy functionality: In search-form.phtml, locate line 44 and modify the URL by changing /blocks/1 to /blocks/0.

🧪 Testing Plan

To verify the new suggestions endpoint, follow these steps:

• Configuration: In the Tweakwise backend, add new item types to the suggestions configuration.
• Linking: Ensure that any items expected under these new types are correctly linked to the relevant categories.
• Validation: Compare the suggestions displayed in your local environment with those in the Tweakwise Demoshop to ensure data parity and accuracy.

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✅ Checklist

• Dependency PR #350 is present.
• Verified quicksearch.phtml changes or legacy fallback.
• Suggestion item types match Tweakwise Demoshop.