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/auth/integration-tests/__tests__/services/auth-user/index.spec.ts

@@ -1,12 +1,11 @@
-import { SqlEntityManager } from "@mikro-orm/postgresql"
 import { AuthUserService } from "@services"
-
+import ContainerLoader from "../../../../src/loaders/container"
 import { MikroOrmWrapper } from "../../../utils"
+import { SqlEntityManager } from "@mikro-orm/postgresql"
+import { asValue } from "awilix"
 import { createAuthProviders } from "../../../__fixtures__/auth-provider"
 import { createAuthUsers } from "../../../__fixtures__/auth-user"
 import { createMedusaContainer } from "@medusajs/utils"
-import { asValue } from "awilix"
-import ContainerLoader from "../../../../src/loaders/container"
 
 jest.setTimeout(30000)
 
@@ -229,7 +228,8 @@ describe("AuthUser Service", () => {
         {
           id: "test",
           provider_id: "manual",
-          entity_id: "test"
+          entity_id: "test",
+          scope: "store"
         },
       ])