feat: scatter streams to different cpu cores

[wu-cl]

• Version of iperf3 (or development branch, such as master or
  3.1-STABLE) to which this pull request applies: master

• Issues fixed (if any):

• Brief description of code changes (suitable for use as a commit message):

With a multi-queue NIC, the actual data packet sending and receiving queues are related to multiple parameters.
Among them, parameters such as XPS and sk_*_queue_mapping are related to the CPU where the socket is created or run.

So this patch makes the following changes

1. Create stream socket in different cpu core
2. Run worker threads in different cpu core