feat: import strategy - sales channels support (#2124)

**What**
- add support for specifying sales channel with import strategy
- additional:
  - refactor SC service to use `retrieve_` pattern
  - fix: pass arguments from `startServerWithEnvironment` to setup server
  - fix: minio undefined resolve/reject calls
  - fix: csv parser - detect missing columns from schema only if the column is required

**How**
- extending schema to expect sales channels columns in an import CSV file

RESOLVES CORE-304

integration-tests/helpers/start-server-with-environment.js

@@ -1,7 +1,13 @@
 const setupServer = require("./setup-server")
 const { initDb } = require("./use-db")
 
-const startServerWithEnvironment = async ({ cwd, verbose, env }) => {
+const startServerWithEnvironment = async ({
+  cwd,
+  redisUrl,
+  uploadDir,
+  verbose,
+  env,
+}) => {
   if (env) {
     Object.entries(env).forEach(([key, value]) => {
       process.env[key] = value
@@ -19,6 +25,8 @@ const startServerWithEnvironment = async ({ cwd, verbose, env }) => {
   const medusaProcess = await setupServer({
     cwd,
     verbose,
+    redisUrl,
+    uploadDir,
     env,
   })