fix: Fix performances on the photos gallery

[g123k]

Hi everyone!

I have investigated a bit the UI jank on the photos' gallery:

• The memory footprint is high
• The color palette is expensive

Potential fixes:

• Use the color palette extractor in a queue-like mechanism: problem fixed, but feels weird to have the color being visible 1 sec later
• Use the algorithm in an Isolate: impossible, dart:ui is not available 🤬
• Use cacheWidth/cacheHeight to lower memory footprint: 👌

That's why I have removed the color extractor algorithm (there are many complaints on the Flutter GitHub). cacheHeight is used to lower the memory footprint

On my Pixel 8 Pro, in profile mode, scrolling the grid have an average of 115 fps. The memory footprint is a bit reduced. Still not perfect, but faaaaar better.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 26 lines in your changes missing coverage. Please review.

Project coverage is 7.18%. Comparing base (4d9c7fc) to head (fdbbb34). Report is 230 commits behind head on develop.

Files	Patch %	Lines
...p/lib/generic_lib/widgets/images/smooth_image.dart	0.00%	14 Missing :warning:
...ooth_app/lib/pages/image/product_image_widget.dart	0.00%	8 Missing :warning:
.../pages/image/product_image_gallery_other_view.dart	0.00%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #5447 +/- ## ========================================== - Coverage 9.54% 7.18% -2.37% ========================================== Files 325 391 +66 Lines 16411 20377 +3966 ========================================== - Hits 1567 1464 -103 - Misses 14844 18913 +4069 ```

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