Ouranosinc / xscen / 12832930116

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Strip catalog attributes - Optional reconstruction version. (#501)

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### Pull Request Checklist:
- [x] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes #499 and fixes #500.
- [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?

* New `strip_cat_attrs` utility to remove those attributes added by the
catalog opening functions.
    + Use this by default in `save_to_zarr` and `save_to_netcdf`.
* In `build_path`, added possibility to have aggregated folder levels
with optional components.
    + Make `version` optionnal in the non-sim schemas.

### Does this PR introduce a breaking change?
* Yes. Saved files will have a few attributes removed. 
* Yes. `build_path` will not fail on a reconstruction dataset missing a
version.

13 of 13 new or added lines in 3 files covered. (100.0%)

3941 of 4513 relevant lines covered (87.33%)

5.15 hits per line