Add Shopify Analytics "Sales by day" (report-level) dataset to the Shopify connector — net/total sales that reconcile to the merchant's own dashboard#1786

Your Shopify connector currently exposes order/line-item-level fields only (order_gross_sales, order_net_sales, order_returns_amount, etc.). Summing these by day does not reproduce Shopify’s native Analytics → “Sales over time” report: gross matches, but net and total sales drift by up to ~8% on any day with returns/refunds, because Shopify’s report books returns on the refund date (not the order date) and nets refunded tax and shipping differently than the order rows do, plus it absorbs order edits/exchanges.

Please expose Shopify’s report-level sales dataset as a Windsor source — ideally by calling the Shopify Admin GraphQL ShopifyQL endpoint FROM sales SHOW gross_sales, discounts, returns, net_sales, taxes, shipping_charges, total_sales, orders TIMESERIES day (the exact query behind the merchant Analytics UI).

Requirements: daily granularity, store-local timezone, returns attributed to refund date, multi-store (one pull, all stores under the connection), and values that tie to the merchant’s Analytics dashboard to the cent.
This single feature removes the only manual step (today we hand-feed a CSV export per store).