Expose app bundle id

Summary: It used to use the id, which is definitely not the app or bundle identifier. It gracefully handles old clients by using the previously used id if the app_id is not found.

Reviewed By: lblasa

Differential Revision: D56578429

fbshipit-source-id: e7a234cea1ca4a70b5840bca9a817b174390a3df

desktop/flipper-plugin/src/plugin/Plugin.tsx

@@ -45,6 +45,11 @@ export interface PluginClient<
    */
   readonly appId: string;
 
+  /**
+   * Identifier that uniquely identifies the application bundle
+   */
+  readonly bundleId: string;
+
   /**
    * Registered name for the connected application
    */
@@ -195,6 +200,9 @@ export class SandyPluginInstance extends BasePluginInstance {
       get appId() {
         return realClient.id;
       },
+      get bundleId() {
+        return realClient.query.app_id ?? 'unknown';
+      },
       get appName() {
         return realClient.query.app;
       },