Add MICN

[WenjieDu]

1. Model description

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

@inproceedings{wang2023micn,
title={{MICN}: Multi-scale Local and Global Context Modeling for Long-term Series Forecasting},
author={Huiqiang Wang and Jian Peng and Feihu Huang and Jince Wang and Junhui Chen and Yifei Xiao},
booktitle={The Eleventh International Conference on Learning Representations },
year={2023},
url={https://openreview.net/forum?id=zt53IDUR1U}
}

2. Check open-source status

• The model implementation is publicly available

3. Provide useful information for the implementation

https://github.com/wanghq21/MICN