[WIP] add TimeSformer model

[fcakyon]

What does this PR do?

Fixes https://github.com/huggingface/transformers/issues/18724

• [x] Create a working environment for successful inference with the original source code
• [x] Create a debugging script for the original source code
• [x] Separate original model from original preprocessing pipeline
• [x] Test the original model with transformers/VideoMAEFeatureExtractor preprocessing pipeline
• [ ] Port TimeSformer to HuggingFace/transformers
• [ ] Adds tests for transformers/TimeSformer implementation

Before submitting

• [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• [x] Did you read the contributor guideline, Pull Request section?
• [x] Was this discussed/approved via a Github issue or the forum? Please add a link to it if that's the case.
• [x] Did you make sure to update the documentation with your changes? Here are the documentation guidelines, and here are tips on formatting docstrings.
• [x] Did you write any new necessary tests?

@NielsRogge