feature(template/just): ✨ respect justfile modules

[AlphaNecron]

https://just.systems/man/en/modules1190.html
just does support modules. This PR makes just template provider traverse through modules and include their recipes.

However, this PR is not done imo. If the parent justfile is read, all of its children should/must be ignored (I haven't implemented this). Current behavior simply gets the nearest justfile instead of the root justfile, and template provider doesn't provide a way to manage global state to store something like a justfile registry.

Given this tree:

# let this be /
- justfile # this should import crates/foo/justfile (the file itself should have no recipes)
- crates
-- foo
--- justfile # this file has a recipe named bar and should be ignored
--- baz

Currently (with this PR), if PWD is /, things work; overseer should show just foo::bar. However, when PWD is / and user navigates deeper (eg foo or baz) through neo-tree (or similar plugins), /justfile isn't read; instead, /crates/foo/justfile is. This might be awkward to run tasks as it literally defeats the whole point of modules...

I'm looking for a way to deal with this.

[stevearc]

This looks fine to me. To solve the issue of only finding a single justfile, you could look into passing a specific search directory using the capability added in #480. Thanks for the PR!

[stevearc]

I think I've managed to get the behavior that you're looking for in 4acd767

[AlphaNecron]

Ah ty <3