About proxy support in Client Lookup phase

In some scenarios, the client lookup also needs to access the network through HTTP or socks proxy. The current version does not support. I fork a version that supports this feature. Is it possible to incorporate it into the pulsar code?

My fork url:
https://gitee.com/liufbox/pulsar.git

Start by reviewing the client lookup implementation in the Pulsar repository and the proposed changes in the linked fork at https://gitee.com/liufbox/pulsar.git. Determine how HTTP and SOCKS proxy support should be incorporated into the lookup path; done means both proxy types work for client lookup and the relevant behavior is covered by tests.

Written by the indexing model from the issue text.