net/cloud-init-devel: [New port] Customize cloud instances

Cloud-init is the industry standard multi-distribution method for
cross-platform cloud instance initialization. It is supported across all
major public cloud providers, provisioning systems for private cloud
infrastructure, and bare-metal installations. This is the development
version, it follows the git HEAD.

WWW: https://cloud-init.io/

PR: 266847
Sponsored by: The FreeBSD Foundation

Co-authored-by: Joseph Mingrone <jrm@FreeBSD.org>