Use mount extension for litho integration

Summary:
Initial implementation of Litho extensions using mount extension. After mount is called on the main thread and we traverse the hierachy. In future we can use mount extensions to construct a sparse tree rather  than sending everything every time.

Scroll is handled with a native UI scroll listener for each litho view. This may break if the litho view is not a direct child of the scroll view.

Reviewed By: mihaelao

Differential Revision: D40021840

fbshipit-source-id: b09086a7a16660225885620609009dddf5b90d3b

android/plugins/litho/build.gradle

@@ -20,6 +20,7 @@ android {
     dependencies {
         compileOnly deps.lithoAnnotations
         implementation project(':android')
+        implementation deps.kotlinCoroutinesAndroid
         implementation deps.lithoCore
         api deps.lithoEditorCore
         api(deps.lithoEditorFlipper) {