Ouranosinc / xclim / 21268476211

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Remove `keep_attrs` option - follow xarray for preserving attributes (#2312)

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### Pull Request Checklist:
- [x] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes #2308
- [x] Tests for the changes have been added (for bug fixes / features)
- [x] (If applicable) Documentation has been added / updated (for bug
fixes / features)
- [x] CHANGELOG.rst has been updated (with summary of main changes)
- [x] Link to issue (:issue:`number`) and pull request (:pull:`number`)
has been added

### What kind of change does this PR introduce?
Removes xclim's `keep_attrs` option. Attributes for indicators are now
implicitly controlled by xarray's option.

When option `as_dataset` is True and a dataset is given as input, or
when a DataTree is given as input, the global attributes are managed
explicitly by xclim, but still following xarray's option.

### Does this PR introduce a breaking change?
Yes. An option was removed.

### Other information:
The documentation of the `as_dataset` option has been updated. A line
has been added to the "usage" notebook.

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