Add p-inherit/padding: inherit to available tokens for padding

[maurer2]

Hello, I think adding a way to set padding: inherit would be a good idea as it could be useful in certain situations.

Absolute positioned element inside a relative positioned parent container, that has padding, ignore said padding (explanation on stack overflow). This issue often crops up in overlays with a clickable close button. In order to move the absolute positioned close button to one of the corners one needs to give it a top/bottom/left/right value that is equal the padding of the parent, so that the close button is aligned properly.

Using padding: inherit we can simplify this slightly and just use the same padding as the parent without actually repeating the value for padding. I created an example here: https://play.tailwindcss.com/H99MdZoHOQ and prepared a draft pr here: #14153

Cheers