Add support to Kotlin DSL

[vyguera]

Expected behaviour

As a developer I would like to be able to configure Shot using Kotlin DSL notation

Actual behaviour

There's no official or documented support for DSL

Steps to reproduce

In your module's build.gradle.kts file add the following, and try to synchronize:

plugins {
  id("com.facebook.testing.screenshot") version "0.15.0"
}

Gradle is not able to resolve plugin artifact 'com.facebook.testing.screenshot:com.facebook.testing.screenshot.gradle.plugin:0.15.0'

Version of the library

0.15.0