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>

yarn.lock

@@ -7902,7 +7902,7 @@ __metadata:
     "@mikro-orm/postgresql": 5.9.7
     awilix: ^8.0.0
     cross-env: ^5.2.1
-    dotenv: ^16.1.4
+    dotenv: 16.3.1
     jest: ^29.6.3
     jsonwebtoken: ^9.0.2
     knex: 2.4.2
@@ -8022,7 +8022,7 @@ __metadata:
     "@mikro-orm/postgresql": 5.9.7
     awilix: ^8.0.0
     cross-env: ^5.2.1
-    dotenv: ^16.1.4
+    dotenv: 16.3.1
     jest: ^29.6.3
     knex: 2.4.2
     medusa-test-utils: ^1.1.40