A less noisy option

The biggest complaint is that RustScan is too noisy.

When I add multiple IP support, what if I do something like this:
```
for every IP address:
check port X
sleep(1)
```

This way, we are only checking 1 port at a time with TIMEOUT delay, but because we are checking them across every IP it should run in the same time, but be less noisy to a specific single server.