rust: add function to check if an extension is enabled This will be used in the next patch Differential Revision: https://phab.mercurial-scm.org/D11812

dirstate: remove unused method Its last usage was inlined in `merge.py`. Differential Revision: https://phab.mercurial-scm.org/D11849

fsmonitor: fix criteria for nonnormalset computation ... oops. Differential Revision: https://phab.mercurial-scm.org/D11875

fsmonitor: incorporate fixes for Python 3.10 (issue6612) Differential Revision: https://phab.mercurial-scm.org/D11862

python2-compat: fix extensions' tests on python2 They are minor output different to be taken in account. Differential Revision: https://phab.mercurial-scm.org/D11861

rhg: add support for narrow clones and sparse checkouts This adds a minimal support that can be implemented without parsing the narrowspec. We can parse the narrowspec and add support for more operations later. The reason we need so few code changes is as follows: Most operations need no special treatment of sparse because some of them only read dirstate (`rhg files` without `-r`), which bakes in the filtering, some of them only read store (`rhg files -r`, `rhg cat`), and some of them read no data at all (`rhg root`, `rhg debugrequirements`). `status` is the command that might care about sparse, so we just disable rhg on it. For narrow clones, `rhg files` clearly needs the narrowspec to work correctly, so we fall back. `rhg cat` seems to work consistently with `hg cat` if the file exists. If the file is hidden by narrow spec, the error message is different and confusing, so that's something that we should improve in follow-up patches. Differential Revision: https://phab.mercurial-scm.org/D11764