More flexible sampled_indicators

[RondeauG]

Pull Request Checklist:

• This PR addresses an already opened issue (for bug fixes / features)
  • This PR fixes #xyz
• (If applicable) Documentation has been added / updated (for bug fixes / features).
• (If applicable) Tests have been added.
• CHANGELOG.rst has been updated (with summary of main changes).
  • Link to issue (:issue:number) and pull request (:pull:number) has been added.

What kind of change does this PR introduce?

• Multiple additions to sampled_indicators to make it more flexible:
  • delta_kind can now be a dictionary and change per variable. It can also be None, in which case it will search for a delta_kind attribute in the variables (which is automatically added by xh.cc.compute_deltas.
  • Weights can be given along a time or horizon dimension. These weights will be broadcast, but the dimension will not be stacked.
  • Added a bunch of missing attributes.

Does this PR introduce a breaking change?

• delta_type was renamed delta_kind to be more consistent with xh.cc.compute_deltas. It is now also no longer a positional argument since it can be None.

Other information:

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[essicolo]

J'ai seulement trouvé une petite coquille dans le notebook, où delta_type n'a pas été modifié dans le markdown.