Add pixi-diff

[pavelzw]

Checklist

• Title of this PR is meaningful: e.g. "Adding my_nifty_package", not "updated meta.yaml".
• License file is packaged (see here for an example).
• Source is from official source.
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[github-actions]

Hi! This is the staged-recipes linter and your PR looks excellent! 🚀

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I wanted to let you know that I linted all conda-recipes in your PR (recipes/pixi-diff/recipe.yaml) and found some lint.

Here's what I've got...

For recipes/pixi-diff/recipe.yaml:

• ❌ Rust packages must include the licenses of the Rust dependencies. For more info, visit: https://conda-forge.org/docs/maintainer/adding_pkgs/#rust

_{This message was generated by GitHub Actions workflow run https://github.com/conda-forge/conda-forge-webservices/actions/runs/12963670111. Examine the logs at this URL for more detail.}

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/pixi-diff/recipe.yaml) and found it was in an excellent condition.

[pavelzw]

failing on windows with

│ │ Error: `cargo metadata` exited with an error:     Updating crates.io index
 │ │     Updating git repository `[https://github.com/pavelzw/pixi`](https://github.com/pavelzw/pixi%60)
 │ │ error: failed to get `pixi` as a dependency of package `pixi-diff v0.0.2 (%SRC_DIR%)`
 │ │ Caused by:
 │ │   failed to load source for dependency `pixi`
 │ │ Caused by:
 │ │   Unable to update https://github.com/pavelzw/pixi?branch=diff-public#8a8f8d42
 │ │ Caused by:
 │ │   path too long: '%BUILD_PREFIX%/.cargo/git/checkouts/pixi-f27cc74e62c451b3/8a8f8d4/crates/pixi_build_frontend/src/protocols/builders/conda_build/snapshots/pixi_build_frontend__protocols__builders__conda_build__protocol__test__conda-render__microarch-level.txt.snap'; class=Filesystem (30)
 │ │ × error Script failed with status 1
 │ │ × error Work directory: 'D:\bld\bld\rattler-build_pixi-diff_1737796743\work'
 │ │ × error To debug the build, run it manually in the work directory (execute the `./conda_build.sh` or `conda_build.bat` script)

[pavelzw]

@conda-forge/help-rust any idea how to work around this? this is due to pixi-diff having a git dependency: https://github.com/pavelzw/pixi-diff/blob/c7f7eb0a7ec33b8e2280a1b2182505c585a587d4/Cargo.toml#L19

[pavelzw]

@conda-forge/help-rust this is ready for review