Embedding Linker using MLM based embeddings (#65)

* initial commit for embedding linker

* update to embedding logic and additional configutations

* handling no link candidates along with fixes

* added testing and fixes from testing

* mypy fixes

* fixed linting (hopefully)

* added thresholds for short and long contexts

* fixed mypy issues

* Added filter before disambig, and various tests

* handling cases with 1 candidate that's filtered out

* added max length logic and finals suggested changes

* changes to config documentation and filter before disambig

Author: adam-sutton-1992