feat: Increase padding for attribute groups

[g123k]

Hi everyone!

On the product, the list of attribute groups can be improved by increasing simply their paddings.
Actually, we have a Wrap widget, with some spacing between elements.

Instead, we pass this space to the padding.

I have also tweaked a little bit the case, where there is only one attribute, to ensure it will fit all the width.

A video with multiple attributes: Multiple.webm
And a single one: Single.webm

[codecov-commenter]

Codecov Report

Merging #4357 (a735149) into develop (580b822) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop    #4357      +/-   ##
===========================================
- Coverage    10.45%   10.45%   -0.01%     
===========================================
  Files          291      291              
  Lines        14409    14413       +4     
===========================================
  Hits          1507     1507              
- Misses       12902    12906       +4     

Impacted Files	Coverage Δ
...app/lib/pages/product/summary_attribute_group.dart	0.00% <0.00%> (ø)
...ges/smooth_app/lib/pages/product/summary_card.dart	0.00% <0.00%> (ø)

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[github-actions]

You can test this PR on: https://app.waldo.com/applications/app-19d476740ba1bb36/sessions