rust-dirstate: add "dirs" rust-cpython binding...
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
