[Bug 6919] New: Rust extensions packaged in a separate PyPI package (hg-rust?)

[mercurial-bugs at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=6919

            Bug ID: 6919
           Summary: Rust extensions packaged in a separate PyPI package
                    (hg-rust?)
           Product: Mercurial
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: feature
          Priority: wish
         Component: Mercurial
          Assignee: bugzilla at mercurial-scm.org
          Reporter: pierre.augier at univ-grenoble-alpes.fr
                CC: mercurial-devel at mercurial-scm.org
    Python Version: ---

It would be good to distribute Rust extensions on PyPI, but it is still
important to be able to install Mercurial without Rust extensions.

I think the cleanest solution would be to package the rust extensions in a
separate PyPI package (hg-rust?).

With a optional dependency of Mercurial one could install mercurial without
rust extensions with

```
pipx install mercurial
```

and with rust extensions

```
pipx install mercurial[rust]
```

Of course, `pipx` could here be replaced by `uv tool`
(https://docs.astral.sh/uv).

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