Add isColor to validate CSS compatible color formats

[Manu-2717]

Validator Request: isColor
Add a color validator that is compatible with the css standard. This includes the main cases as well as the edge cases where the color format would work. This would help validate colors for use in web applications, such as when storing user selected color in a database. isColor is meant to support all css color formats - that is - if it works in css it would be validated. This includes:

hex
hexa
rgb
rgba
hsl
hsla
You could validate your color against all color formats or a particular color format.
Predefined color names such as 'red' or 'blue' are not supported under this validation.

[divyanshbhai]

I want to work on this issue