feat: Support for '-' in nutritional values

[g123k]

Hi everyone!

Here is an implementation for #4745: the fact that a value is not available on the product.
In addition to this modification, there is also:

• TextEditingControllerWithInitialValue renamed to TextEditingControllerWithHistory, to also store the previous value
• In the Nutrition Facts screen, calls to MediaQuery are replaced by the flex mechanism
• The Controller for each field is passed through a Provider
• To limit the number of redraws, a _NutritionCellTextWatcher is used to only call when a value is set or not

A video of the implementation:

3.mov

[codecov-commenter]

Codecov Report

Attention: 78 lines in your changes are missing coverage. Please review.

Comparison is base (02a9942) 9.67% compared to head (38cc56f) 9.66%.
Report is 1 commits behind head on develop.

Files	Patch %	Lines
...h_app/lib/pages/product/nutrition_page_loaded.dart	1.53%	64 Missing ⚠️
...ckages/smooth_app/lib/pages/text_field_helper.dart	0.00%	7 Missing ⚠️
..._app/lib/pages/product/add_basic_details_page.dart	0.00%	4 Missing ⚠️
..._app/lib/pages/product/add_other_details_page.dart	0.00%	2 Missing ⚠️
...b/pages/product/nutrition_add_nutrient_button.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #4909      +/-   ##
==========================================
- Coverage     9.67%   9.66%   -0.02%     
==========================================
  Files          318     318              
  Lines        16115   16145      +30     
==========================================
+ Hits          1559    1560       +1     
- Misses       14556   14585      +29     

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[monsieurtanuki]

Hi @g123k!

My 2 cents:

• I confirm that I find the UI ugly and not very intuitive
• I'm not sure it will fit on small screens with your extra column
• I'm a bit surprised that you manage to put - as a double? value - I would have expected you to edit NutritionContainer too. But I probably haven't had a look at all the details of your code

As long as it works, I approve.

[monsieurtanuki]

File is a bit too big. Please consider splitting it.