Hierarchical import lists

Group imports under their shared prefix and keep each source path visible. Nested lists accept aliases, self and globs. A pub use list retains the visibility of each original declaration; grouping never makes a private item public.

// Group related imports while keeping aliases on individual leaves.
mod tools {
    pub mod numbers { pub fn twice(value: int) -> int { value * 2 } }
    pub mod labels { pub fn label(value: int) -> str { "total: {value}" } }
}
use tools::{numbers::{twice}, labels::{label as display}}
print(display(twice(6))) // expect: total: 12

The formatter preserves the authored list. Diagnostics and editor navigation still point to each import leaf.

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