deskutils/tatuin: [NEW PORT] Task Aggregator TUI for N providers

Tatuin is a task aggregation tool that allows you to manage and track your tasks
from various providers in one convenient place.

Tatuin provides users with an easy-to-use Text User Interface (TUI) for viewing
and managing their tasks.

WWW: https://github.com/panter-dsd/tatuin/

Approved by: yuri@ (Mentor)

Differential Revision: https://reviews.freebsd.org/D52908