[pixi] dependency tree support for python pixi

[prabhu]

depends attribute could be parsed to construct a dependency tree.

- kind: conda
  name: git
  version: 2.46.0
  build: pl5321h41514c7_0
  subdir: osx-arm64
  url: https://conda.anaconda.org/conda-forge/osx-arm64/git-2.46.0-pl5321h41514c7_0.conda
  sha256: a60e58088c4dceba8a746e36329b7e068829379906bf8bad16118d7ef24109b7
  md5: 21b63b50e83acaf387015c00a10dd286
  depends:
  - __osx >=11.0
  - libcurl >=8.9.0,<9.0a0
  - libexpat >=2.6.2,<3.0a0
  - libiconv >=1.17,<2.0a0
  - libintl >=0.22.5,<1.0a0
  - libzlib >=1.3.1,<2.0a0
  - openssl >=3.3.1,<4.0a0
  - pcre2 >=10.44,<10.45.0a0
  - perl 5.*
  license: GPL-2.0-or-later and LGPL-2.1-or-later
  size: 11653455