Ouranosinc / xclim / 10014748698

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Fix time indexer encoder and parser in fitting standardized index and… (#1843)

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### Pull Request Checklist:
- [x] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes #1842 
- [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?

Fix the encoder and parser for the time indexer in the
`xc.indices.stats.standardized_index_fit_params` and
`xc.indices.stats.standardized_index` to allow no indexer, non-array
indexers, and multiple indexers.

### Does this PR introduce a breaking change?

No. But the new parser is not compatible with the previous as the format
of params.attrs["time_indexer"] is different. If any saved `params` from
previous version were reloaded, it may lead to errors.

### Other information:

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