feat: 5301 - added an erasing tool for proofs

[monsieurtanuki]

What

• Added an "eraser tool" when the user crops the proof image. The typical use case is barring sensitive data in a receipt, e.g. name or account number.

Screenshots

CropImage	getCroppedBitmap

Uploaded image: https://prices.openfoodfacts.net/img/0003/pRFjLvNol8.jpg

Part of

• Prices images improvement #5301

Files

New files:

• eraser_model.dart: Model about the eraser tool: coordinate computations.
• eraser_painter.dart: Painter of the eraser tool: displaying thick lines.

Impacted files:

• background_task_add_price.dart: displaying the eraser bars if relevant; new eraserCoordinates field
• background_task_image.dart: minor refactoring
• crop_helper.dart: new enableEraser field offsets parameters
• crop_page.dart: added an erasing tool for proofs; refactored
• crop_parameters.dart: new eraserCoordinates parameter
• operation_type.dart unrelated minor refactoring
• product_crop_helper.dart: minor refactoring
• product_price_item.dart: unrelated fix for TEST env
• proof_crop_helper.dart: minor refactoring
• pubspec.lock: wtf
• pubspec.yaml: needed upgrade of crop_image to 1.0.13

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 215 lines in your changes missing coverage. Please review.

Project coverage is 7.58%. Comparing base (4d9c7fc) to head (ba174bf).
Report is 165 commits behind head on develop.

Files	Patch %	Lines
packages/smooth_app/lib/pages/crop_page.dart	0.00%	68 Missing ⚠️
...ages/smooth_app/lib/pages/prices/eraser_model.dart	0.00%	61 Missing ⚠️
...ages/smooth_app/lib/background/operation_type.dart	0.00%	27 Missing ⚠️
..._app/lib/background/background_task_add_price.dart	0.00%	23 Missing ⚠️
...es/smooth_app/lib/pages/prices/eraser_painter.dart	0.00%	20 Missing ⚠️
...mooth_app/lib/pages/prices/product_price_item.dart	0.00%	7 Missing ⚠️
packages/smooth_app/lib/pages/crop_helper.dart	0.00%	4 Missing ⚠️
...ooth_app/lib/background/background_task_image.dart	0.00%	3 Missing ⚠️
...ages/smooth_app/lib/pages/product_crop_helper.dart	0.00%	1 Missing ⚠️
...ckages/smooth_app/lib/pages/proof_crop_helper.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5341      +/-   ##
==========================================
- Coverage     9.54%   7.58%   -1.97%     
==========================================
  Files          325     373      +48     
  Lines        16411   18854    +2443     
==========================================
- Hits          1567    1430     -137     
- Misses       14844   17424    +2580     

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[teolemon]

I believe we also need #5318 to be on the safe side of things

[monsieurtanuki]

Thank you @teolemon for your review!

I believe we also need #5318 to be on the safe side of things

Working on it.