feat: add port scanner and related makefile

[HeartBeat1608]

Feature

Added a pure go implementation of a simple port scanner. It uses go routines to run the scans concurrently, and uses waitgroups and channels to ensure that the operations are managed correctly.

At the time of this PR, the scanner only logs the open ports to the stdout stream. It is possible to store the list of open ports in a slice (array) like structure and report it in various formats or even export it, as required.