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Add DeseasonalityTransform
🚀 Feature Request
Add DeseasonalityTransform that will extract seasonality from series.
Motivation
ETNA lib should have this advanced method
Proposal
Add example code
Test cases
No response
Alternatives
For inspiration look here https://github.com/alan-turing-institute/sktime/blob/2a0df3f52a6fe67f5509f6199cc60f01e3dc0adf/sktime/transformations/series/detrend/_deseasonalize.py#L21
Additional context
No response
Checklist
- [ ] I discussed this issue with ETNA Team