Set HSN code (for India) while syncing items from Shopify

For India, the HSN code is mandatory in Item master. Currently, the Shopify integrations does not set HSN code while syncing items from Shopify to ERPNext. It gives validation (via India Compliance app) while syncing and fails.

Proposed Solution:
In Shopify Settings, we can introduce a child table to enter default HSN code based on "Item Group". And while syncing items, we can set the HSN code based on Item Group.