rust: Add Repo::dirstate_map and use it in `rhg status` This moves low-level dirstate wrangling out of the status command and into a more reusable location. The open dirstate map is lazily initialized and kept on the Repo object, for reuse by sub-sequent calls. Differential Revision: https://phab.mercurial-scm.org/D11398

pub mod dirstate_map;
pub mod dispatch;
pub mod on_disk;
pub mod owning;
mod owning_dispatch;
pub mod path_with_basename;
pub mod status;