Enhance Avalanche Library to Support Time Series Data and Models

**Background Motivation:**
Currently, Avalanche library lacks comprehensive support for time series data, which has become increasingly popular in industrial settings and language models.

To address this gap, I propose the inclusion of time series models like simple 1D CNN or LSTM, and time series datasets such as ECG or Physionet Challenge into Avalanche. This enhancement would greatly benefit users who require continual learning capabilities for time series tasks, offering a more versatile and valuable toolset.

Thank you for considering this feature request.