sysutils/handlr: New port

handlr is an alternative to xdg-utils written in Rust. It provides
several advantages over xdg-utils as listed out in its repo at
https://github.com/chmln/handlr.

PR:		262218
Submitted by:	sec.research.2005@gmail.com
Reported by:	sec.research.2005@gmail.com