textproc/scancode-toolkit: create port

ScanCode scans code and detects licenses, copyrights, package manifests,
dependencies and more. It can be also used to discover and inventory open source
and third-party packages used in your code.

WWW: https://github.com/nexB/scancode-toolkit

PR: 230114
Submitted by: Kai <freebsd_ports@k-worx.org>