Add color-scheme selection component

[amanmahajan7]

https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/light-dark

System

Dark

Light

Adding rdg-dark classname in light mode

Adding rdg-light classname in dark mode

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.61%. Comparing base (3c3b617) to head (a3a1cdb).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3825      +/-   ##
==========================================
- Coverage   98.61%   98.61%   -0.01%     
==========================================
  Files          46       46              
  Lines        3615     3611       -4     
  Branches      773      773              
==========================================
- Hits         3565     3561       -4     
  Misses         50       50              

Files with missing lines	Coverage Δ
src/style/core.ts	100.00% <ø> (ø)

... and 4 files with indirect coverage changes

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[amanmahajan7]

Can still force dark mode using this class

[amanmahajan7]

It is easy to override the default light/dark styles if needed by setting a variable

:root {
  --rdg-color-scheme: light;
}

grid is now always rendered in the light mode