NLP helper (spaCy) lacks proper support for complex prompts in regards to residency

[ppfeister]

Sylva uses spaCy to help parse arbitrary text for possible residency info.

This helper module can be found at: https://github.com/ppfeister/sylva/blob/master/src/sylva/helpers/nlp.py

To reproduce using the included test suite, developers can either run pytest --runxfail (detailed) or pytest -rx (minimal).

Two examples of currently failing prompts from the test suite:
- I've lived in both Boston and Bremen before
- I've vacationed in Manchester, but lived in Bremen and Boston
Note that the second example is expected to not return Manchester, only Bremen and Boston.

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General improvements to this module (accuracy, match rate...) are always welcome.