[feature request] Client support set ServiceUrlProvider

[shibd]

Motivation

This is an earlier feature of the Pulsar java client and has no related PIP.

Refer to Java client PR: apache/pulsar#2543

Alternatives

Anything else?

[shibd]

I will start work on it.

[BewareMyPower]

From the discussion in #170 and https://lists.apache.org/thread/cojz6qxpc7v0j8vy0w476ttt0f89zr3z, we decide not to implement this interface for the C++ client.