feat: Cart Customer link + create cart with customer

[olivermrbl]

What

• Add Cart Customer read-only link
• Add findOrCreateCustomer step to CreateCartWorkflow. Three scenarios are covered:
  • Retrieve customer from passed ID
  • Retrieve customer from passed email
  • Create customer with passed email
• Use signed-in customer id in POST /store/carts
• Restructure tests

Tests

• Cart Customer link queries
• Create cart with existing customer
• Create cart creates customer using email
• Compensate: Should delete customer, if created from email
• Compensate: Should not delete customer, if customer already existed

Note: Compensation flows are tested using the local workflow instead of the API, as we cannot modify the global workflow (yet)

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[srindom]

LGTM!