Migrate to custom plugin

Summary: In this step, we want to visualize our mammals in a custom card view. For this reason, we need to replace `createTablePlugin` with a React component that extends `FlipperPlugin`.

Reviewed By: jknoxville

Differential Revision: D15183324

fbshipit-source-id: 329cdc5c6cbd7e1435538e8cdddf049d914ff221

android/tutorial/src/main/java/com/facebook/flipper/sample/tutorial/plugin/SeaMammalFlipperPlugin.kt

@@ -33,9 +33,9 @@ class SeaMammalFlipperPlugin : FlipperPlugin {
         connection = null
     }
 
-    override fun runInBackground(): Boolean = false
+    override fun runInBackground(): Boolean = true
 
     private     fun newRow(row: FlipperObject) {
         connection?.send("newRow", row)
     }
-}
+}