feat(medusa): Allow to query order/product by SC (#1867)

**What**

Allow to query the products and orders by sales channels

**How**

Updating the existing end points and repositories  (if necessary) to take a new query params that is sales_channel_id as an array of string

**Tests**

Add new integration tests

Fixes CORE-295
Fixes CORE-288

integration-tests/api/factories/simple-order-factory.ts

@@ -46,7 +46,7 @@ export type OrderFactoryData = {
 export const simpleOrderFactory = async (
   connection: Connection,
   data: OrderFactoryData = {},
-  seed: number
+  seed?: number
 ): Promise<Order> => {
   if (typeof seed !== "undefined") {
     faker.seed(seed)

integration-tests/api/factories/simple-sales-channel-factory.ts

@@ -1,4 +1,4 @@
-import { SalesChannel } from "@medusajs/medusa"
+import { Product, SalesChannel } from "@medusajs/medusa"
 import faker from "faker"
 import { Connection } from "typeorm"
 
@@ -7,6 +7,7 @@ export type SalesChannelFactoryData = {
   description?: string
   is_disabled?: boolean
   id?: string
+  products?: Product[],
 }
 
 export const simpleSalesChannelFactory = async (
@@ -20,7 +21,7 @@ export const simpleSalesChannelFactory = async (
 
   const manager = connection.manager
 
-  const salesChannel = manager.create(SalesChannel, {
+  let salesChannel = manager.create(SalesChannel, {
     id: data.id ?? `simple-id-${Math.random() * 1000}`,
     name: data.name || faker.name.firstName(),
     description: data.description || faker.name.lastName(),
@@ -28,5 +29,19 @@ export const simpleSalesChannelFactory = async (
       typeof data.is_disabled !== undefined ? data.is_disabled : false,
   })
 
-  return await manager.save(salesChannel)
+  salesChannel = await manager.save(salesChannel)
+
+  if (data.products) {
+    const promises = []
+    for (const product of data.products) {
+      promises.push(
+        manager.query(`
+          INSERT INTO product_sales_channel (product_id, sales_channel_id) VALUES ('${product.id}', '${salesChannel.id}');
+        `)
+      )
+    }
+    await Promise.all(promises)
+  }
+
+  return salesChannel
 }