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Iterative creeping - save and load weights (#594)

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### Pull Request Checklist:
- [ ] 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).
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### What kind of change does this PR introduce?

* New argument `steps` to `creep_weights` so that we creep iteratively
this number of time, so filling a boundary of thickness `steps * n`. The
`creep_fill` detects it and applies the weights in sequence too.
* New methods to save those weights to disk and then load them back.
Similar to what `xESMF` does, but for our own `creep_fill`. This syntax
is completely xscen-specific. In theory CF conventions have what it
needs to encode/decode sparse arrays, but the implementation is still to
be done.

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


### Other information:
I already use that technique in PC for the sea masking. And I now want
to use that for SPS. The idea is that `creep_weights` is slow but
`creep_fill` is fast, so if the mask is constant, you don't want to
recompute it often.


Peut-être que ceci pourrait être utile à @DoMatte.

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