Add bloks integration infra + Layout result wrapper

Summary:
This adds the base infra for the UIDebugger bloks integration as well as an implementation for the Layout result wrapper for bloks. When theUIDebugger is connected we wrap the original layout result with a debug varient that delegates all methods to the original layout result but also provides access to the bloks model.

This allows the UIDebugger to inspect the Layout result and bloks model together

Reviewed By: pasqualeanatriello

Differential Revision: D43444444

fbshipit-source-id: ac531a0c7491c05db1d6f7671e3ab09c73c213b9

android/src/main/java/com/facebook/flipper/plugins/uidebugger/UIDebuggerFlipperPlugin.kt

@@ -31,6 +31,8 @@ class UIDebuggerFlipperPlugin(val context: UIDContext) : FlipperPlugin {
 
   @Throws(Exception::class)
   override fun onConnect(connection: FlipperConnection) {
+    isConnected = true
+
     Log.i(LogTag, "Connected")
     this.context.connectionRef.connection = connection
     this.context.bitmapPool.makeReady()
@@ -54,6 +56,7 @@ class UIDebuggerFlipperPlugin(val context: UIDContext) : FlipperPlugin {
 
   @Throws(Exception::class)
   override fun onDisconnect() {
+    isConnected = false
     this.context.connectionRef.connection = null
     Log.i(LogTag, "Disconnected")
 
@@ -66,4 +69,9 @@ class UIDebuggerFlipperPlugin(val context: UIDContext) : FlipperPlugin {
   override fun runInBackground(): Boolean {
     return false
   }
+
+  companion object {
+    var isConnected: Boolean = false
+      private set
+  }
 }