feat(auth): add authentication endpoints (#6265)

**What**
- Add authentication endpoints: 
  - `/auth/[scope]/[provider]` 
  - `/auth/[scope]/[provider]/callback`
- update authenticate-middleware handler
- Add scope field to user
- Add unique constraint on scope and entity_id

note: there's still some remaining work related to jwt auth to be handled, this is mainly focussed on session auth with endpoints



Co-authored-by: Sebastian Rindom <7554214+srindom@users.noreply.github.com>

packages/customer/package.json

@@ -55,7 +55,7 @@
     "@mikro-orm/migrations": "5.9.7",
     "@mikro-orm/postgresql": "5.9.7",
     "awilix": "^8.0.0",
-    "dotenv": "^16.1.4",
+    "dotenv": "16.3.1",
     "knex": "2.4.2"
   }
 }