Spacy and Huggingface integrations

[adamkells]

Description

This PR adds convenient integrations for integrating pipelines from spacy, huggingface or langchain into healthchain pipelines.

These NLP pipelines constitue a single component of the Healthchain pipeline.

Related Issue

This addresses issue #78 .

Changes Made

• Modifies the Document container object to be less specific to spacy and to allow addition of information from spacy/hf/langchain.
• Adds integration to instantiate components from each of the three libraries.
• Adds documentation with examples for each integration as well as full example using all 3 in one pipeline.

Testing

Unit tests were added for all new functionality. As transformers is an optional dependency, the huggingface tests are skipped in CI but were run locally.

Checklist

• I have read the contributing guidelines
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Additional Notes

[jenniferjiangkells]

Looks good overall, just left some comments on some stylistic decisions and documentation improvements. Also note updated usage of add_node() and importing from .base. You good to make changes or want me to take over?

[jenniferjiangkells]

I think you accidentally pasted a url in the middle of a code snippet in the documentation but otherwise lgtm

[jenniferjiangkells]

?