Feat: Extract Engine Upgrade

[rsteele5]

Goals:

• Add ProcessingVisitors to the ComponentRegistry and utilize in DocumentExtractEngine
  • The visitor runtime config can be stored in base-config.yml under processing.visitors as a string list (.../config/extract/base/base-config.yml), and can be overridden by any child config like all other properties.
• Add field one-to-many relationship with derived fields
  • If a field's transform function returns a list for one or more of the derived fields, a field is created for every element in the list. (i.e.: A service line number corresponding to multiple remark codes)
• check and update documentation. See guide and ask the team.

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FIX: Span, Cut-point, and Region issues #189

• Resolves edge case bug when start and stop lines are equal, but start and end pages are not.
  • If left unresolved any span that meets the above conditions will incorrectly generate a Span of height 1 on the start page.
• fix: Multiple regions within a MatchSection
• fix: Region accepted as "in scope" if "Fully-contained"
• fix: Final Stop selector now includes the last line instead of using it as a cut-point