feat: use python_site_packages_path field when available for installing noarch: python packages, CEP-17

[jjhelmus]

Description

Use the python_site_packages_path field from repodata to set the directory when noarch: python packages get installed as specified in CEP-17.

This the start of an implementation. Wanted to get feedback on the approach before updating other crates and tests.

[baszalmstra]

This totally seems like the right approach! 👍

[baszalmstra]

I took the liberty to continue your work, bring it up to date and add python bindings.

[baszalmstra]

Its a bit hard to test because there doesnt appear to be a python package yet that has this field set. Im relatively sure that it will work so Im going to go ahead and merge this when CI turns green. If we encounter bugs we can fix them in a seperate PR.

[jjhelmus]

Thanks much for taking over this change @baszalmstra.

There are three test packages in the jjhelmus/label/sp_pathchannel on anaconda.org that contain this field. They were created as part of conda/conda-build#5502.

I checked with the sample packages with valid paths and got the expected result with this change.
For example:

❯ pixi run rattler create -c jjhelmus/label/sp_path -c conda-forge python=3.99.90 imagesize
✨ Pixi task (rattler in default): cargo run --bin rattler --release -- create -c jjhelmus/label/sp_path -c conda-forge python=3.99.90 imagesize
    Finished `release` profile [optimized] target(s) in 0.22s
     Running `target/release/rattler create -c jjhelmus/label/sp_path -c conda-forge python=3.99.90 imagesize`
Target prefix: /Users/jhelmus/workspace/rattler/.prefix
Installing for platform: OsxArm64
Loaded 180 records in 279.544ms
Virtual packages:
  - __unix=0=0
  - __osx=14.6.1=0
  - __archspec=1=m1

⠁ solving                                                                                                                                                                      INFO resolvo::solver: ╒══ Install imagesize=1.4.1=pyhd8ed1ab_0 at level 1 (derived from Requires(<root>(InternalSolvableId(0)), imagesize *))
 INFO resolvo::solver: ╘══ Propagation completed
 INFO rattler::install::clobber_registry: Unclobbering 0 files
✔ validate cache       2 packages in 0s
✔ installing packages  took 2ms                                                                                                                                               ✔ Successfully updated the environment in 3.471209ms
+ python 3.99.90 0
+ imagesize 1.4.1 pyhd8ed1ab_0
rattler on  main [$?] via 🦀 1.81.0-aarch64-apple-darwin via 🅒 base took 2s
❯ tree .prefix
.prefix
├── conda-meta
│   ├── imagesize-1.4.1-pyhd8ed1ab_0.json
│   └── python-3.99.90-0.json
└── sample_path
    └── from_the_file
        └── index_json
            ├── imagesize
            │   ├── __init__.py
            │   └── imagesize.py
            └── imagesize-1.4.1.dist-info
                ├── INSTALLER
                ├── LICENSE.rst
                ├── METADATA
                ├── RECORD
                ├── REQUESTED
                ├── WHEEL
                ├── direct_url.json
                └── top_level.txt

7 directories, 12 files

[baszalmstra]

Awesome! Thanks for testing!