Support Animation Longhand

[AryanJ-NYC]

First of all, amazing job with the animation feature. It's made my life a lot easier.

A small request would be the ability to use the "longhand" animation format on top of the animation shorthand (as described in the Tailwind documentation). For example, right now, it doesn't seem possible to use the animation-fill-mode property.

I'm thinking something like:

animation: {
  'fade-in': {
    animationName: 'fade-in',
    animationDuration: '1s',
    animationTimingFunction: 'ease-in-out',
    animationIterationCount: 1,
    animationFillMode: 'both',
  },
  'fade-out': {
    animationName: 'fade-out',
    animationDuration: '1s',
    animationTimingFunction: 'ease-in-out',
    animationIterationCount: 1,
    animationFillMode: 'both',
  },
},

(I've tried this already in hopes that it just worked)

Thanks!