net/route-summarization: [New Port] Lightweight CIDR aggregator using Perl's Net::CIDR::Lite

A lightweight CIDR aggregation utility built in Perl using the
Net::CIDR::Lite module. This tool summarizes IPv4 and IPv6 prefixes
from standard input and optionally formats output for SPF record
usage.

Inspired by the original concept described in Random Thoughts.

PR: 294430
Author: Jordan Montesse <ports@brtsvcs.net>