Extract signals from diff result

[danielballan]

Summary of ideas (copied from PROPOSALS.md from NYC event)

Per row:

• type of change
• contains date
• contains non-visible tag
• contains any tag
• contains number
• contains link tag
• total characters changed
• (maybe!) NLP metrics like "edit distance"

Per document:

• total characters changed
• history (timing) of changes

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[Mr0grog]

This is pretty tightly tied in with #175 and edgi-govdata-archiving/web-monitoring-db#416. We should consolidate. (Or break apart into very concrete individual items.)

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[Mr0grog]

Prioritizing this for myself to do the aforementioned consolidation/breakup.

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[Mr0grog]

This is happening over on the web-monitoring-task-sheets repo.

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