Add text-based UI management functions, based on Rich.

Review Request #13476 — Created Jan. 3, 2024 and submitted — Latest diff uploaded

Information

rbinstall
master

Reviewers

The installer now depends on rich, a Python library that makes it
easier to handle color, emoji, and layout in text-based applications.

We build upon those primitives, adding light/dark themes,
non-interactive prompt handling, headers, admonitions, multi-paragraph
display, terms, key/value display, ordered lists, and our own defaults
for progress bars.

This will be used by the upcoming install wizard.

Some of this may later be reworked into a shared library, for use in
both rbinstall and rb-site.

Made extensive use of this in the wizard.

As this is purely visual work, there's no unit tests for this module.

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