text: Title: Functionality to resume from checkpoint in `TimeSeriesPredictor`
  Body: ## Description
  `MultiModelPredictor.load` allows one to specify `resume=True` to allow you to resume training from a checkpoint. Is there any plan to include similar functionality for `TimeSeriesPredictor.load` and the associated training procedures? Or a way to hack it perhaps. I have a large selection of large time series datasets and I'm interested in training a big global model to predict them.
   
  ## References
  - multi modal [docs](https://auto.gluon.ai/stable/api/autogluon.multimodal.MultiModalPredictor.load.html)
  - time series [docs](https://auto.gluon.ai/stable/api/autogluon.timeseries.TimeSeriesPredictor.load.html)
  
  