📋 Guided Project.toml editor

[fonsp]

Implement #3099, see the issue for more info

https://github.com/user-attachments/assets/eb498f8a-39ce-4a12-b657-386da1e544eb

But without https://github.com/JuliaLang/Pkg.jl/issues/4086 the usefulness is limited

Try this Pull Request!

Open Julia and type:

julia> import Pkg
julia> Pkg.activate(temp=true)
julia> Pkg.add(url="https://github.com/fonsp/Pluto.jl", rev="project-toml-editor")
julia> using Pluto