Make LeakCanary a Separate Plugin

Summary: Pull Request resolved: https://github.com/facebook/flipper/pull/559

Reviewed By: passy

Differential Revision: D17546936

fbshipit-source-id: dce128a771b73e8b18dfc2b78ee99502c3f1ce86

android/sample/build.gradle

@@ -70,5 +70,6 @@ dependencies {
     debugImplementation project(':fresco-plugin')
     debugImplementation project(':network-plugin')
     debugImplementation project(':litho-plugin')
+    debugImplementation project(':leakcanary-plugin')
     releaseImplementation project(':noop')
 }