Convert RGB (Red, Green, Blue) to HSL (Hue, Saturation, Lightness)
color:rgb_to_hsl(INT $red, INT $green, INT $blue) : ARRAY
$x = color:rgb_to_hsl(224, 240, 246)
#=> [
#=> "hue" => 196.0,
#=> "saturation" => 0.55,
#=> "lightness" => 0.92
#=> ]
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