Ouranosinc / xscen / 10927149911

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Manage RotatedPole defaults, fix typing (#455)

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### Pull Request Checklist:
- [x] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes #xyz
- [x] (If applicable) Documentation has been added / updated (for bug
fixes / features).
- [x] (If applicable) Tests have been added.
- [x] This PR does not seem to break the templates.
- [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?

* `central_rotated_longitude` is kept as None if it is not in the
dataset attributes.
* Attributes are cast as floats before `ccrs.RotatedPole`.

### Does this PR introduce a breaking change?


### Other information:

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