[FEAT] Added NLinear model

[ggattoni]

Since DLinear was added recently, I think it might be a good idea to also have NLinear in the library.
If you are interested and/or if I'm missing something please let me know

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Check out this pull request on 

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[AzulGarza]

thank you so much @ggattoni! could you sign the CLA? thank you!🙌

[ggattoni]

thank you so much @ggattoni! could you sign the CLA? thank you!🙌

Sure, it's done! Let me know if I can do anything else

[cchallu]

Hi @ggattoni! Thanks for your contribution. The nb-sync test failed, I believe you missed installing the hooks with nbdev. Can you try running nbdev_install_hooks, modifying the new linear notebook, and pushing it again? (contributing guide: https://github.com/Nixtla/neuralforecast/blob/main/CONTRIBUTING.md)

[ggattoni]

Hi @ggattoni! Thanks for your contribution. The nb-sync test failed, I believe you missed installing the hooks with nbdev. Can you try running nbdev_install_hooks, modifying the new linear notebook, and pushing it again? (contributing guide: https://github.com/Nixtla/neuralforecast/blob/main/CONTRIBUTING.md)

Whoops, I thought I had configured it correctly, now it should be fixed