Rename all metadata according to the new convention

[Luthaf]

This follows up to https://github.com/lab-cosmo/metatensor/pull/514, and changes most of the metadata names:

• spherical_harmonics_l => o3_lambda
• species_xxx => xxx_type
• structure, center => system, atom
• spherical_harmonics_m => o3_mu
• add a o3_sigma key to all spherical expansions

TODO:

• [x] release metatensor with the changes above and integrate them here
• [x] rename properties for power spectrum & CG

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📚 Documentation preview 📚: https://rascaline--285.org.readthedocs.build/en/285/

[github-actions[bot]]

Here is a pre-built version of the code in this pull request: wheels.zip, you can install it locally by unzipping wheels.zip and using pip to install the file matching your system

[frostedoyster]

I can't seem to import rascaline.torch. This may or may not be related to the changes here, my environment might have issues

tests/utils/test_model_io.py:6: in <module>
    import rascaline.torch
../.local/lib/python3.8/site-packages/rascaline/torch/__init__.py:12: in <module>
    from . import utils  # noqa: E402, F401
../.local/lib/python3.8/site-packages/rascaline/torch/utils.py:87: in <module>
    spec.loader.exec_module(module)
../.local/lib/python3.8/site-packages/rascaline/utils/__init__.py:4: in <module>
    from .power_spectrum import PowerSpectrum  # noqa
../.local/lib/python3.8/site-packages/rascaline/utils/power_spectrum/__init__.py:1: in <module>
    from .calculator import PowerSpectrum
../.local/lib/python3.8/site-packages/rascaline/utils/power_spectrum/calculator.py:6: in <module>
    from ._classes import CalculatorBase, IntoSystem, Labels, TensorBlock, TensorMap
../.local/lib/python3.8/site-packages/rascaline/utils/power_spectrum/_classes.py:3: in <module>
    from ...calculator_base import CalculatorBase
E   ImportError: cannot import name 'CalculatorBase' from 'rascaline.torch.calculator_base' (/home/filippo/.local/lib/python3.8/site-packages/rascaline/torch/calculator_base.py)

[Luthaf]

Please run ./scripts/clean-python.sh and then re-install everything!