feat: add linking method to ecommece customer controller

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Context

The Primary address and contact of a customer are customarily used to aquire defaults across ERPNext.

They furtheromre serve as a fallback customer identification scheme, for example based on email or phone number of their primary contact.

However, the ecommerce controller did not properly set those fields upon creating a new customer

Proposed Solution

• Ensure the primary_* fields are set for the Shopify Integration (since only the Shopify Integration uses the controller)

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ping

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