MudTable: Added StripedGroups parameter to stripe per group instead of per row.

[Etzix]

Description

This adds the parameter StripedGroups to the table that can be used togheter with the grouping system to stripe even/odd groups, instead of Striped that stripes based on even/odd rows.

Open to improvement suggestions, but this implementation works. I tried to do this using only CSS, but that seems impossible. In the end my CSS + C# implementation got so complex that i decided to scrap it and make this PR instead.

How Has This Been Tested?

Visually and simple unit test.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests.

[Etzix]

Can't figure out why the code quality check is failing. Appreciate any help

I was looking at the wrong file 😄

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 89.87%. Comparing base (28bc599) to head (4c2b7f8).
Report is 7 commits behind head on dev.

Files	Patch %	Lines
.../MudBlazor/Components/Table/MudTableGroupRow.razor	50.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #8604      +/-   ##
==========================================
+ Coverage   89.82%   89.87%   +0.04%     
==========================================
  Files         412      412              
  Lines       11878    11886       +8     
  Branches     2364     2364              
==========================================
+ Hits        10670    10682      +12     
+ Misses        681      676       -5     
- Partials      527      528       +1     

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[Etzix]

I'm not sure how i should write test coverage for the 2 lines that Codecov is mentioning. Any help is appreciated 🙏

[Etzix]

I made some improvements and added a simple test for the striped classes.

[henon]

I am not sure about this. I'd rather want a way to allow any kind of custom CSS classes applied per row. Like a Func<RowContext, string> RowClassFunc which you call with any necessary info in the row context like index, group, element etc and the user can return the css class per row. This would allow so many different applications like a line-based striping that alternates between groups etc.