devel/tuicr: Add port

tuicr is an interactive code review tool, providing a portion of the
Github experience in a TUI. And, most importantly it has Vi-ish
keybindings.

• GitHub-style continuous diff in the terminal. Scroll through every changed file in one stream.
• PR-style comments at the line, range, file, and review level.
• Review tracking at file or hunk granularity, persisted across sessions.
• Three export targets: push a real review to GitHub, GitLab, or Bitbucket; copy structured markdown to your clipboard; or pipe to stdout.
• Works with git, jj, and mercurial. Reviews uncommitted changes, commit ranges, or any GitHub PR, GitLab MR, or Bitbucket PR.