WIP Prototype using charmbracelet/huh for prompter

[andyfeller]

Relates https://github.com/cli/cli/issues/8084 Relates #164

With go-survey/survey being unmaintained, this is an initial prototype of using https://github.com/charmbracelet/huh as an optional prompting experience including support for accessiblity needs.

Additionally, this commit includes a simple example to demo the existing and new experiences in examples/prompter/main.go:

• by default, the existing go-survey/survey experience
• specifying GH_PROMPTER=accessible, the new charmbracelet/huh experience in rich mode
• specifying ACCESSIBLE=1 with GH_PROMPTER=accessible, the new charmbracelet/huh experience in accessible mode

https://github.com/cli/go-gh/assets/2089743/1b1d347f-293b-46b6-bae0-4fd9cd3e43c1