Custom dialing function for rafthttp transport

[ArielSzekely]

What would you like to be added?

Hello!

Is there any chance that a custom dialing function could be added to the rafthttp transport API, to enable users of the raft modules to supply their own dialing code (without having to re-implement the whole transport interface)?

Thank you!

Why is this needed?

I am working on a project which disables some Linux syscalls (like socket and connect) and instead establishes network connections via a proxy. I would like to still be able to use the raft modules, but supply my own dialing implementation to enable the raft module to use my proxy when dialing.

I've implemented this in a fork of the repo, but I am not sure what the best/most stylistically appropriate way of doing this is.