convert tsfeatures lib to nbdev framework

[jope35]

This pr uses the nbdev framework to build the tsfeatures lib. All old files are copied 1-on-1, eager to get some feedback on this

[jmoralez]

Hey @jope35, thanks for the initiative, we support this. Just some requests before we review this more thoroughly:

• Please restore the files under the .github folder.
• Please restore the .gitignore, LICENSE and setup.py files.
• Please remove the pre-commit-config.yaml and .ruff.toml. These can be added in a later PR so that we can focus on those changes specifically.
• Please restore and move the compare_with_r.py file to a scripts folder or similar.

[jope35]

@jmoralez thanks for the quick scan. will incorporate the changes 👍

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[jmoralez]

Some more requests:

• Please update the settings.ini file with the current settings in setup.py, e.g. version should be 0.4.5. For the author and other stuff you can refer to this file.
• Please update the setup.py file. I believe you can copy this one
• Please remove the ordering from the notebooks (the number prefixes)

[jmoralez]

Thanks for the updates. Can you please merge tsfeatures_core.ipynb with features.ipynb? They both should be the same notebook that exports the tsfeatures module.

[jope35]

Merge tsfeatures_core.ipynb with features.ipynb, the result is exported to tsfeatures.