Ouranosinc / xclim / 6341312292

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Raise when reduced dims are chunked in map_blocks (#1482)

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### Pull Request Checklist:
- [x] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes #1481
- [x] Tests for the changes have been added (for bug fixes / features)
- [ ] (If applicable) Documentation has been added / updated (for bug
fixes / features)
- [x] CHANGES.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?
If a `map_blocks`-wrapped function receives input chunked along the
dimensions marked as "reduced", it raises an error.

This means one cannot chunk the training dataset (`QM.ds`, for example)
along the distribution ('quantiles') or group ('month', 'dayofyear')
dimensions.

Previously, this didn't raise an error, but the adjustment would be done
separately for each chunk, yielding incorrect results, silently.

### Does this PR introduce a breaking change?
No.

### Other information:

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