on-TCP-port-open event waiter

[kamadorueda]

It's normal for people to $ sleep n while waiting for servers to wake up, this is however a poor implementation. A better and more elegant solution is to wait for the TCP port to open and to start listening asynchronously

Example implementation:

• https://gitlab.com/fluidattacks/product/-/tree/708bb9d1662b8431c2439d540465c72167b9b719/makes/applications/makes/wait