feat(medusa): SC service (#1784)

* add sales channel service and empty api index

* add integration testing file

* add tyeps

* remove ts directive

* add sales channel test

* update import

* remove unused import

* fix tests

integration-tests/api/__tests__/admin/sales-channels.js

@@ -0,0 +1,42 @@
+const path = require("path")
+
+const { useApi } = require("../../../helpers/use-api")
+const { useDb } = require("../../../helpers/use-db")
+const adminSeeder = require("../../helpers/admin-seeder")
+const startServerWithEnvironment =
+  require("../../../helpers/start-server-with-environment").default
+
+jest.setTimeout(30000)
+
+describe("sales channels", () => {
+  let medusaProcess
+  let dbConnection
+
+  beforeAll(async () => {
+    const cwd = path.resolve(path.join(__dirname, "..", ".."))
+    const [process, connection] = await startServerWithEnvironment({
+      cwd,
+      env: { MEDUSA_FF_SALES_CHANNELS: true },
+    })
+    dbConnection = connection
+    medusaProcess = process
+  })
+
+  afterAll(async () => {
+    const db = useDb()
+    await db.shutdown()
+
+    medusaProcess.kill()
+  })
+
+  describe("GET /admin/sales-channels", () => {
+    it("is true", () => {
+      // dummy test to ensure test suite passes
+      expect(true).toBeTruthy()
+    })
+  })
+  describe("POST /admin/sales-channels", () => {})
+  describe("GET /admin/sales-channels/:id", () => {})
+  describe("POST /admin/sales-channels/:id", () => {})
+  describe("DELETE /admin/sales-channels/:id", () => {})
+})