MudColor: Add Palette algorithms

[ScarletKuro]

Description

Since we already have the Lerp algorithm (#10275) and MudColor implements HSL information, ColorLighten, and ColorDarken, I thought it would make sense to add palette algorithms.
NB!: These algorithms are very simple, generic and most common ones. They do not allocate any additional memory, as I only use IEnumerable and yield return.

I replaced the statically generated palette in ColorPickerPaletteExample with our algorithms:

• The first line shows the tint palette.
• The second line shows the shades palette.
• The third line shows both the tint and shades palettes at the same time (reverted sequence).
• The fourth line shows the analogous palette.
• The fifth line shows the gradient palette between two colors.
• The sixth line shows the multi gradient between three(it can be more) colors. (new: added in MudColor: Add GenerateMultiGradientPalette #10318)

How Has This Been Tested?

Unit tests added, visually

Type 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)
• Documentation (fix or improvement to the website or code docs)

Checklist

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.54%. Comparing base (e7cea92) to head (7d232eb).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev   #10313   +/-   ##
=======================================
  Coverage   91.54%   91.54%           
=======================================
  Files         414      415    +1     
  Lines       13016    13017    +1     
  Branches     2457     2457           
=======================================
+ Hits        11916    11917    +1     
  Misses        549      549           
  Partials      551      551           

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[ScarletKuro]

@henon @danielchalmers just tagging you both to let you know that this exists now.
@versile2, maybe you could use something from this, but as I mentioned in #10263 (comment), you have something more custom. Upd for my response, with GenerateMultiGradientPalette you can actually replace half of code.