textproc/code-minimap: New port textproc/code-minimap

A high performance code minimap render.

This tool [1] is for generating text minimaps at speed. You can use it
to implement IDE-like minimap plugin for a terminal text editor,
minimap.vim [2] for example.

[1] https://github.com/wfxr/code-minimap
[2] https://github.com/wfxr/minimap.vim

Submitter becomes maintainer. Already maintainer of other ports.

PR: 269951