Rename parse() methods to fromString()

[olivervogel]

The following classes have a static parse() method which is the equivalent for creating objects from string. I'm considering renaming this method to fromString() since there are other from methods in the library.

• Intervention\Image\DataUri
• Intervention\Image\Color
• Intervention\Image\Colors\Oklch\Color
• Intervention\Image\Colors\Oklab\Color
• Intervention\Image\Colors\Cmyk\Color
• Intervention\Image\Colors\Hsv\Color
• Intervention\Image\Colors\Rgb\Color
• Intervention\Image\Colors\Hsl\Color