rust-status: move to recursive traversal to prepare for parallel traversal I have looked into traversing the working directory in parallel either by a recursive or an iterative algorithm. The recursive approach won quite decisively both in terms of performance and code readability. You can look at my experiment here: https://heptapod.octobus.net/Alphare/rayon-recursive-traversal The chance of a stack overflow happening because the directories get too nested seems slim. This change does not yet do anything in parallel. Differential Revision: https://phab.mercurial-scm.org/D8215

rust-pathauditor: use interior mutability for use in multi-threaded contexts The usual recommendation for using `RwLock` or `Mutex` is that if there are about as many write as there are reads, use `Mutex`, and if there are more reads than writes, use `RwLock`. If after the main bottleneck (i.e. parallel traversal) is removed this shows up on profiles, we should investigate using the `parking_lot` since we don't need a poisoning API, or maybe move to different types of caches entirely. Differential Revision: https://phab.mercurial-scm.org/D8213

rust-pathauditor: actually populate the `audited_dirs` cache I forgot this when rewriting this logic during the review process. Differential Revision: https://phab.mercurial-scm.org/D8212

rust-pathauditor: actually split Windows shortname aliases at `~` Right now, splitting with a max of 1 parts is useless. Differential Revision: https://phab.mercurial-scm.org/D8211

debuginstall: add entry about re2 Rust bindings when applicable Differential Revision: https://phab.mercurial-scm.org/D8226

rust-cpython: add `debug` module to expose debug information to Python This will be mostly used in `debuginstall`. Differential Revision: https://phab.mercurial-scm.org/D8225