message: Use explicit import instead of * in mod collections
diff: pub use crate::collections::{
  hash::{Hashed, StarlarkHashValue},
  - hasher::*,
  + hasher::StarlarkHasher,
  small_map::{MHIntoIter, MHIter, MHIterMut, SmallMap},
  small_set::SmallSet,
  };
  