rust-dirstate: call new "dirs" rust implementation from Python This is a simple module attribute replacement, will take precedence over the Python and C implementations. Differential Revision: https://phab.mercurial-scm.org/D6395

rust-dirstate: add "dirs" rust-cpython binding There is an obvious performance and memory issue with those bindings on larger repos as it copies and allocates everything at once, round-trip. Like in the previous patch series, this is only temporary and will only get better once we don't have large data structures going to and from Python. Differential Revision: https://phab.mercurial-scm.org/D6394

rust-dirstate: add "dirs" Rust implementation Following the work done in d1786c1d34fa and working towards the goal of a complete Rust implementation of the dirstate, this rewrites the `dirs` class. There is already a C implementation, which relies heavily on CPython hacks and protocol violations for performance, so I don't expect this to perform as well for now, as this is very straight-forward code. The immediate benefits are new high-level documentation and some unit tests. Differential Revision: https://phab.mercurial-scm.org/D6393

relnotes: added description about statemod._statecheck Differential Revision: https://phab.mercurial-scm.org/D6557