Add Android Compose screenshot testing plugin and setup as a gradle convention plugin

ComposeAndroidScreenshotTestConventionPlugin.kt

class ComposeAndroidScreenshotTestConventionPlugin : Plugin<Project> {
  override fun apply(target: Project) = with(target) {
    pluginManager.apply("com.android.compose.screenshot")

    android {
      if (this !is CommonExtension<*, *, *, *, *, *>) {
        throw RuntimeException("Expected module to be of base type CommonExtension")
      }

      @Suppress("UnstableApiUsage")
      experimentalProperties["android.experimental.enableScreenshotTest"] = true

      buildFeatures {
        compose = true
      }

      dependencies {
        "debugImplementation"("org.jetbrains.compose.ui:ui-tooling:${ComposeBuildConfig.composeVersion}")
      }
    }
  }
}

private fun Project.android(action: BaseExtension.() -> Unit) =
  extensions.configure<BaseExtension>(action)