feat: add Redis username support (#11608)

### What problem does this PR solve?

Support for Redis 6+ ACL authentication (username)

close #11606 

### Type of change

- [x] New Feature (non-breaking change which adds functionality)
- [x] Documentation Update

conf/service_conf.yaml

@@ -38,6 +38,7 @@ oceanbase:
     port: 2881
 redis:
   db: 1
+  username: ''
   password: 'infini_rag_flow'
   host: 'localhost:6379'
 task_executor: