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/__fixtures__/auth-user/index.ts

@@ -1,5 +1,5 @@
-import { SqlEntityManager } from "@mikro-orm/postgresql"
 import { AuthUser } from "@models"
+import { SqlEntityManager } from "@mikro-orm/postgresql"
 
 export async function createAuthUsers(
   manager: SqlEntityManager,
@@ -8,15 +8,18 @@ export async function createAuthUsers(
       id: "test-id",
       entity_id: "test-id",
       provider: "manual",
+      scope: "store",
     },
     {
       id: "test-id-1",
       entity_id: "test-id-1",
       provider: "manual",
+      scope: "store",
     },
     {
       entity_id: "test-id-2",
       provider: "store",
+      scope: "store",
     },
   ]
 ): Promise<AuthUser[]> {