Add more color theme implemenations

Describe the feature you'd like

Currently there is only Intervention\Image\Colors\Themes\VibrantMuted\Theme. More could be added here.

Ideas

Monochromatic

Extracts a single dominant color and create a harmonious palette based on different lightness/darkness variations.

• Swatches: base, dark, darker, light, lighter, accent

Complementary

Identifiy colors that are opposite on the color wheel for high contrast.

• Swatches: primary, primaryLight, primaryDark, secondary, secondaryLight, secondaryDark

WarmCool

Separates warm and cool tones from the image.

• Swatches: warmPrimary, warmSecondary, warmAccent, coolPrimary, coolSecondary, coolAccent