The bundle should let you register load paths for the Sass compiler

[stof]

This has 2 effects:

• it simplifies the way to import third-party code like bootstrap (as they can be loaded from the load path)
• the reporting of deprecations in dart-sass has a special behavior for code loaded from load paths, recognizing it as third-party code that you might not control. This is why the quietDeps option exists for instance (exposed as --quiet-deps in the CLI)