feat(dashboard): basic Order UI (#7225)

**WHAT**
- rudimentary list and details pages
- fix Order<>Promotion link
- fix Order<>SalesChannel link

**NOTE**
- displaying basic info since we don't have Fulfillments & Payments linked ATM
- `disaply_id` needs to be added to order
- `tax_rate` needs to be added to order

---


https://github.com/medusajs/medusa/assets/16856471/cd4e98c7-345e-4193-8c1e-ad4ed1584993



Co-authored-by: Carlos R. L. Rodrigues <37986729+carlos-r-l-rodrigues@users.noreply.github.com>

packages/modules/link-modules/src/definitions/readonly/index.ts

@@ -5,4 +5,5 @@ export * from "./cart-sales-channel"
 export * from "./inventory-level-stock-location"
 export * from "./order-customer"
 export * from "./order-product"
+export * from "./order-sales-channel"
 export * from "./store-default-currency"

packages/modules/link-modules/src/definitions/readonly/order-sales-channel.ts

@@ -0,0 +1,29 @@
+import { ModuleJoinerConfig } from "@medusajs/types"
+
+import { Modules } from "@medusajs/modules-sdk"
+
+export const OrderSalesChannel: ModuleJoinerConfig = {
+  isLink: true,
+  isReadOnlyLink: true,
+  extends: [
+    {
+      serviceName: Modules.ORDER,
+      relationship: {
+        serviceName: Modules.SALES_CHANNEL,
+        primaryKey: "id",
+        foreignKey: "sales_channel_id",
+        alias: "sales_channel",
+      },
+    },
+    {
+      serviceName: Modules.SALES_CHANNEL,
+      relationship: {
+        serviceName: Modules.ORDER,
+        primaryKey: "sales_channel_id",
+        foreignKey: "id",
+        alias: "orders",
+        isList: true,
+      },
+    },
+  ],
+}