Fetch more product details (various prices, etc.)

[millette]

POST:

• https://www.sqdc.ca/api/product/calculatePrices {"products":["628582000104-P"]}
• https://www.sqdc.ca/api/product/specifications {"productId":"628582000104-P","variantId":"628582000098"}

[millette]

Partly done, now fetching variant prices (calculatePrices).