Fix the callstack sent from error reporting runnable

Summary:
The crash logged from `ErrorReporterRunnable` wasn't detailed. For example look at the following video.
Also for some reason the `FlipperConnection` interface doesn't have an argument for crash name. Thus I changed the js side of the plugin to accept `crash.name` to be undefined.

{F155526537}

Reviewed By: passy

Differential Revision: D14852561

fbshipit-source-id: 6daf9847535b4508fa312b4f940b014911aae2e5

android/src/test/java/com/facebook/flipper/plugins/inspector/InspectorFlipperPluginTest.java

@@ -318,8 +318,11 @@ public class InspectorFlipperPluginTest {
         new FlipperObject.Builder().put("ids", new FlipperArray.Builder().put("test")).build(),
         responder);
 
+    assertThat(connection.errors.size(), equalTo(1));
     assertThat(
-        connection.errors, CoreMatchers.hasItem(hasThrowableWithMessage("Unexpected null value")));
+        connection.errors,
+        CoreMatchers.hasItem(
+            hasThrowableWithMessage("java.lang.RuntimeException: Unexpected null value")));
   }
 
   private class TestNode {