commit b27f6d32cc10580c95019df82a9b606b1c5e49f0
author Gabriel Peal <gpeal@users.noreply.github.com> Sat Oct 24 13:41:19 2020 -0700
committer GitHub <noreply@github.com> Sat Oct 24 13:41:19 2020 -0700
tree 54a4272aaae1835b4879f5aa4800ca8e0051b65e
parent 81b4e7873bd00312775a34c0ab9a2a3d2a641ae8

Initial implementation of Lottie Compose (#1652)

This PR kicks off the work required to use Lottie with [Jetpack Compose](https://developer.android.com/jetpack/compose).
The API here will almost certainly change over time but I feel confident that this is a solid starting point with which to begin further API discussions.

The three primitives are:
* LottieAnimation: the `@Composable` that does the rendering aka replacement for LottieDrawable or LottieAnimationView.
* LottieAnimationSpec: a specification for where an animation should come from, whether it be from resources or the internet.
* LottieAnimationState: the current animation state (playing, progress, repeatCount, etc) and the ability to control the animation(start(), stop(), etc).

Its most basic usage is:
```
@Composable
fun MyComposable() {
  val animationSpec = remember { LottieAnimationSpec.Url("https://...") }
  LottieAnimation(animationSpec)
}
```

Or slightly more advanced:
```
@Composable
fun MyComposable(loaded: Boolean) {
  val animationSpec = remember { LottieAnimationSpec.Url(animationData.file) }
  val animationState = rememberLottieAnimationState()
  onCommit(loaded) {
    if (loaded) animationState.play()
  }
  LottieAnimation(animationSpec, animationState)
}
```