More 7.X Prediction Text Attrs + Poe Improvement

[mawelborn]

• Conditionally sets all three prediction text attributes when the text has been changed.
  • prediction["normalized"]["formatted"]
  • prediction["normalized"]["text"]
  • prediction["text"]
  • Previously only prediction["normalized"]["formatted"] and prediction["text"] were set, and unconditionally. Which at current time, avoids edge cases in review. But this future proofs it a little more, and avoids overwriting the raw OCR text necessarily when the text hasn't been changed.
• More robustly sets prediction["normalized"]["structured"]["checked"] and
  prediction["normalized"]["structured"]["signed"] for form extractions.
• Uses the more idiomatic name utils in place of utilities.
• Configures Poe as a plugin rather than as a dev dependency, which means it can be invoked with the shorter command
  poetry poe <task> in addition to the original poetry run poe <task>.