Metaobjects import improvements and Matrixify compatibility

We’ve improved metaobject imports with better field processing, enhanced error handling, and full Matrixify compatibility for grouping behavior.

🚀 What’s New

• Matrixify-compatible grouping – when no ID or Handle columns are present, all rows will be grouped for the same metaobject, matching Matrixify behavior exactly.

🔧 Improvements

• Enhanced field processing – metaobject fields now use the same robust reference resolution logic as metafields, ensuring consistent handling of file references, product references, and other reference types.
• Real-time API queries – removed caching in favor of direct API queries for each metaobject lookup, ensuring you always get the most current data from Shopify.
• Better error messages – added specific error codes MOBJ004 and MOBJ005 for missing definition types and definition not found scenarios.

🐛 Fixes

• Fixed error code typo – corrected MBOJ002 to MOBJ002 for consistency with other metaobject error codes.

📋 Technical Details

These improvements ensure that:

• File references like "image.jpg" are properly resolved to Shopify file GIDs
• List references are correctly formatted as JSON arrays
• Reference metafields work consistently between regular metafields and metaobject fields
• Error messages provide clear guidance on how to resolve import issues