Add `tsfresh` into optional dependancies

[alex-hse-repository]

🚀 Feature Request

In release tsfresh==0.20.0 matrixprofile dependency became optional, so now we can try to add tsfresh as our optional dependency

Proposal

1. In pyproject.toml

• Add tsfresh = ~0.20.0 as optional dependency
• Add tsfresh to classification extras
• Rebuild poetry.lock

2. In github configs:

• Remove installing poetry run pip install tsfresh==0.19.0 from tests.yaml and notebooks.yaml
• Add "classification" to extras here and here

3. In etna/settings

• Rewrite the suggestion to install tsfresh to install the "classification" extras, now it should check the existing of deps from "classification" extras

4. In examples/classification.ipynb

• Remove the part about installation tsfresh manully

5. We also can remove tsfresh part from libs and import the necessary methods from the original library

• Here we also need to fix the LICENSE text here

Test cases

No response

Additional context

No response