[Enhancement] assign proxy IP replace, When the BE Nodes is in intranet IP

### Search before asking

- [X] I had searched in the [issues](https://github.com/apache/incubator-doris/issues?q=is%3Aissue) and found no similar issues.

### Description

When Use Stream Load to access FE's public network address to import data, but is redirected to the intranet IP, this situation casue connect timeout.

### Solution

can we add a options "benodes" in DorisOptions to force assign backends IP?

### Are you willing to submit PR?

- [X] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)

No file or test is named in the issue. Start at DorisOptions and trace the Stream Load request and redirect handling to see how backend addresses are selected; done means an option can force the backend IP used when the FE public address redirects to an unreachable intranet address, with the timeout scenario covered.

Written by the indexing model from the issue text.