Beta-rec

- Add new model: TiSASRec
- Clean unused packages

New Model
- add [SASRec](https://arxiv.org/abs/1808.09781) model

Other minor updates:

- update black isort version, black==20.8b1, isort==5.7.0
- fix the issue of tune.track.
- fix the issue of sasrec.
- format all the codes.

Changes
- Add Docker Image Auto-release
- Save evaluation result as dataframe/csv 356
- Add new model Low-pass Collaborative Filter (LCF)
- Fix Cuda valueError

- Change the default values of max_n_update and max_epochs.
- Implement an improved leave-one-out data splitting method.
- Remove unused pkg.
- fix the cpuinfo keyword incompatibility bug

Updates:
- [x] Add Recommenders for [LightGCN](https://github.com/beta-team/beta-recsys/blob/master/beta_rec/recommenders/lightgcn.py), [NGCF](https://github.com/beta-team/beta-recsys/blob/master/beta_rec/recommenders/ngcf.py), [NCF](https://github.com/beta-team/beta-recsys/blob/master/beta_rec/recommenders/ncf.py), [Triple2vec](https://github.com/beta-team/beta-recsys/blob/master/beta_rec/recommenders/triple2vec.py), [VBCAR](https://github.com/beta-team/beta-recsys/blob/master/beta_rec/recommenders/vbcar.py)
- [x] Add Dockerfile at root for auto-build
- [x] Fix the cpuinfo keyword incompatibility bug

Updates:
- [x] Add Amazon Reviews datasets --> [link](https://beta-recsys.readthedocs.io/en/develop/notes/datasets.html)
- [X] New API for Recommenders. --> [notebook example](https://github.com/beta-team/beta-recsys/blob/master/examples/MF_API_test.ipynb)
- [X] Move the data filtering process to the main dataset classes. -->[Usage](https://beta-recsys.readthedocs.io/en/develop/notes/datasets.html#usage)
- [X] New feature for experiment --> [Usage](https://github.com/beta-team/beta-recsys/blob/develop/examples/experiment.ipynb)