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[ENH] Add a warping path series transformer #2001
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not sure what this is for, but seems fine except for the warping path in the constructor, I do not think it should default to None
After finding a warping path from elastic measures, this transformer re-aligns a series to adjust for warping corrections.

For example, on two samples of the ECG200 dataset:
With a dtw path as such:

After transforming both series (see example in docstring), we get these two new series:

And this is the new dtw path between them:
