Refactoring and Bumping to V0.2.0

[Lupin1998]

Release of OpenSTL V0.2.0 for various spatioTemporal predictive learning (STL) tasks.

Code Refactoring

1. Rename the project to OpenSTL instead of SimVPv2 with module name refactoring.
2. Refactor the code structure thoroughly to support DDP and non-dist training & testing.

New Features

1. Update the Weather Bench dataloader with 5.625deg, 2.8125deg, and 1.40625deg settings.

Updating documents

1. Update documents of video prediction and weather prediction benchmarks. Provide config files for supported mixup methods.
2. Update docs/en documents for the basic usages and new features of V0.2.0.

Fix Bugs

1. Fix bugs in training loops and validation loops to save GPU memory.
2. There might be some bugs in not using all parameters for calculating losses in ConvLSTM CrevNet, which should use --find_unused_parameters for DDP training.

[Lupin1998]

OpenSTL V0.2.0 has been released. We will fix bugs and update new features of V0.2.0 in recent commits.