Add additional datasets

This package becomes more and more useful with the amount of datasets available for training and evaluation. Many of these entries are from [this survey paper](https://arxiv.org/abs/2004.05214)

**High prio**

**Low prio**
- [ ] Bouncing Balls
- [ ] Cityscapes
- [ ] Sea Surface Temperature (SST)
- [ ] Traffic/Taxi BJ
- [ ] Radar Echo Dataset
- [ ] UCF101
- [ ] Weizmann
- [ ] HMDB-51
- [ ] Penn Action Dataset
- [ ] THUMOS-15
- [ ] Camvid
- [ ] Comma.ai
- [ ] Apolloscape
- [ ] Sports1m
- [ ] YouTube-8M
- [ ] YFCC100M
- [ ] Van Hateren
- [ ] NORBvideos
- [ ] Robotic Pushing (Finn et al.)
- [ ] RoboNet
- [ ] ViSOR
- [ ] PROST
- [ ] Arcade Learning
- [ ] Inria 3DMovie v2
- [ ] Robotrix
- [ ] UASOL

- [ ] ...