[FEATURE] Add NLP

[jpdeleon]

Add nlp module to analyze output of disclosures module

Examples:

• medium article
• NLP papers with code

[enzoampil]

@jpdeleon Let's create checklist of models to include in the first release of this.

Some of my ideas so far (glad to take these on as well since I've implemented them already):

• [ ] Standard spacy named entity recognition - org, person, location, money, and more.
• [ ] BERT / Transformers based NER - org, person, location. Can also fine-tune on more entities to make the entity choices as comprehensive as spacy
• [ ] Sentiment analysis w/ BERT
• [ ] Named entity linking for companies - this will allow us to map mentioned companies to their actual financial information (financial statements, disclosures, etc)