New port: devel/lazygit: Simple terminal UI for git commands

lazygit is a CLI tool to handle git repository, written in Go wigh the gocui
library. You can add files easily, resolve merge conflicts, checkout recent
branches easily, scroll through logs/diffs of branches/commits.stash,
push/pull quickly, squash down and rename commits in CLI.

WWW: https://github.com/jesseduffield/lazygit

Approved by: pi (mentor)
Differential Revision: https://reviews.freebsd.org/D16862