Entity linking
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This pull request adds an entity linking model, dataset, loss, example training code, and demo notebook based on the paper "Self-Alignment Pretraining for Biomedical Entity Representations"

You can run through the notebook tutorial or run everything on the command line.

To run everything on the command line follow these steps

1) Download the UMLS datset file `MRCONSO.RRF` from the NIH website and place it in the `examples/nlp/entity_linking/data` directory.

2) Run the following commands from the `examples/nlp/entity_linking` directory
```
python data/umls_dataset_processing.py
python self_alignment_pretraining.py project_dir=. 
python data/umls_dataset_processing.py --index
python build_index.py --restore
python query_index.py --restore
```
The model will take ~24hrs to train on two GPUs and ~48hrs to train on one GPU. By default the project directory will be "." but can be changed by adding the flag `--project_dir=<PATH>` after each of the above commands and changing `project_dir=<PATH>` in the `self_alignment_pretraining.py` command.