[ENH] EXPERIMENTAL: Example notebook based on the new data pipeline

[phoeenniixx]

Description

This PR adds example notebook for the new v2 data pipeline vignette, having the basic implementation of the tft model using this version. For more info see #1812 , #1811

Colab link: https://colab.research.google.com/drive/148MyhcNfYEh4CZ6vBXLqQNsUBF0n6_0v?usp=sharing

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[phoeenniixx]

Hi @fkiraly, I am getting this error:

I just downloaded the notebook from colab and pasted it in the repo, is there anything else I should do to avoid this? Really have no idea 😅

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Codecov Report

Attention: Patch coverage is 0% with 173 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@4c30351). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...ting/models/temporal_fusion_transformer/_tft_v2.py	0.00%	97 Missing ⚠️
pytorch_forecasting/models/base/_base_model_v2.py	0.00%	76 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1813   +/-   ##
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  Coverage        ?   84.20%           
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  Files           ?       53           
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  Partials        ?        0           

Flag	Coverage Δ
cpu	84.20% <0.00%> (?)
pytest	84.20% <0.00%> (?)

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