bugreport-service: Get bugreport based on event data

bugreport-service: Get bugreport based on event data

A bugreport identifier is sent along with BugreportCreated event so that
client can request the details of the bugreport to which the event
related:

  static void bugreport_created_cb(diagnostics_ctx_h ctx, void *user_data)
  {
      ...
      const char *params[] = {"--type", "crash-info-json"};
      diagnostics_data_h data;
      diagnostics_get_data(ctx, params, ARRAY_SIZE(params), &data);

      size_t bytes;
      char buff[1024];
      diagnostics_data_read(data, buff, sizeof(buff), 0, &bytes);
      ...
  }

  int main()
  {
      ...
      diagnostics_set_notification_cb(bugreport_created_cb, NULL);
      diagnostics_subscribe_event("BugreportCreated", "org.tizen.bugreport-service");
      g_main_loop_run(mainloop);
      ...
  }

Change-Id: I056f16743e656504dcefe0972eae00bc4b6f58ab