Command to list available build targets

[ElectreAAS]

This feature request is more of a wish list than anything.

Description of the feature

I'd like a command like dune list-targets that only outputs build targets that a human would manually type, nothing intermediary. dune describe targets/aliases both do something kind of similar, but not really accurately.

Usage

• For newcomers and mistypers: they might not know/remember that they should type dune build src/main.exe, even though main.exe isn't a file they have.
• It would make shell completion for dune build really easy, and that's a feature in and of itself. Fish does this with make, and it's a really nice UX.
• In a project that has a lot of tests that might be ran differently (like dune itself), having a confirmation that it's dune build @feature-repro and not feature_repro for example, makes development easier.

Priority

No