feat: implement consolidation approval process for shared-wagon bookings

- Add migration for consolidation approvals table and status enum
- Create ConsolidationApprovalService to handle approval logic
- Implement repository for managing consolidation approvals
- Add entity for consolidation approval with necessary fields
- Develop frontend components for displaying and managing consolidation approvals
- Create tests for consolidation approval service to ensure correct behavior

apps/edr-freight-api/src/modules/contracts/contracts.controller.ts

@@ -1194,6 +1194,9 @@ export class ContractsController {
       bookingId,
       dto,
       user,
+      // Recorded as the requester on the approval: the person who created the
+      // pairing may not be the one who approves it.
+      user?.id ?? user?.sub ?? null,
     );
   }