Update status pages to show package map and plugins

pkg/analysis_server/lib/src/plugin/plugin_manager.dart

Index: pkg/analysis_server/lib/src/plugin/plugin_manager.dart
diff --git a/pkg/analysis_server/lib/src/plugin/plugin_manager.dart b/pkg/analysis_server/lib/src/plugin/plugin_manager.dart
index 9117fdf3b6dfbde66e49ba311d55853d4fe42fe3..56ae7eb74ff2b4b2daf994c5fc6e449516921ff1 100644
--- a/pkg/analysis_server/lib/src/plugin/plugin_manager.dart
+++ b/pkg/analysis_server/lib/src/plugin/plugin_manager.dart
@@ -313,6 +313,12 @@ class PluginManager {
   }
 
   /**
+   * Return a list of all of the plugins that are currently known.
+   */
+  @visibleForTesting
+  List<PluginInfo> get plugins => _pluginMap.values.toList();
+
+  /**
    * Add the plugin with the given [path] to the list of plugins that should be
    * used when analyzing code for the given [contextRoot]. If the plugin had not
    * yet been started, then it will be started by this method.