Thingsvision

- memory fixes

- adapted Command Line Interface (CLI) to the most recent changes in the library (see v2.3)
- added automatic device checks

- added possibility to easily extract features from [harmonized models](https://vicco-group.github.io/thingsvision/AvailableModels.html#harmonization) from the [Harmonization repo](https://github.com/serre-lab/harmonization)
- added various DINO models to the available [`ssl`](https://vicco-group.github.io/thingsvision/AvailableModels.html#ssl) models
- fixed dependency issues for custom models

- added tests for custom model extractor and refactored torch and tensorflow extractor classes

- added various [DINO](https://vicco-group.github.io/thingsvision/AvailableModels.html#ssl) SSL models to `thingsvision` (weights retrieved from [torch.hub](https://pytorch.org/hub/))

- added `output_type` option for choosing between `torch.Tensor` and `np.ndarray` for type of returned features in `extractor.extract_features(...)` for substantial speed-ups during the extraction process (moving tensors to CPU is costly which is why we want to avoid it wherever possible)
- note that the above is only possible for `backend="pt"` (not for `backend="tf"`)