Add PITS

[WenjieDu]

1. Model description

PITS should be included in PyPOTS, and could start from the imputation task.

@inproceedings{lee2024pits,
title={Learning to Embed Time Series Patches Independently},
author={Seunghan Lee and Taeyoung Park and Kibok Lee},
booktitle={The Twelfth International Conference on Learning Representations},
year={2024},
url={https://openreview.net/forum?id=WS7GuBDFa2}
}

2. Check open-source status

• The model implementation is publicly available

3. Provide useful information for the implementation

https://github.com/seunghan96/pits