Ouranosinc / xsdba / 15000016853

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Spectral utils (#81)

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### Pull Request Checklist:
- [ ] This PR addresses an already opened issue (for bug fixes /
features)
  - This PR fixes #xyz
- [ ] (If applicable) Documentation has been added / updated (for bug
fixes / features).
- [ ] (If applicable) Tests have been added.
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### What kind of change does this PR introduce?

* Compute spectral variance, apply a discrete cosine transform filter,
etc.

### Does this PR introduce a breaking change?

No

### Other information:

Maybe this deserves its own python file

I know there are many functions and many helpers with it. I'm open to
some serious restructuring.

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