**Is your feature request related to a problem? Please describe.**

Currently, the only way to show the About panel on macOS is by creating a `{role: 'about'}` menu item and click it. I need to be able to show it manually.

**Describe the solution you'd like**

Electron already has the method, so it's just about exposing this to JS and documenting it:

https://github.com/electron/electron/blob/8ba271efba691357ab1970c1a553b4e019125574/atom/browser/browser_mac.mm#L376

Would also be useful to be able to pass in the panel options directly to the method to override the defaults.

I would call the method: `app.showAboutPanel(options)`

**Describe alternatives you've considered**

None.
atom/browser/api/atom_api_app.cc
std::vector<mate::Dictionary> result;
  int processor_count = base::SysInfo::NumberOfProcessors();
  for (const auto& process_metric : app_metrics_) {
    mate::Dictionary pid_dict = mate::Dictionary::CreateEmpty(isolate);
    mate::Dictionary cpu_dict = mate::Dictionary::CreateEmpty(isolate);
    pid_dict.SetHidden("simple", true);
    cpu_dict.SetHidden("simple", true);
    cpu_dict.Set(
        "percentCPUUsage",
        process_metric.second->metrics->GetPlatformIndependentCPUUsage() /
            processor_count);
#if !defined(OS_WIN)
    cpu_dict.Set("idleWakeupsPerSecond",
                 process_metric.second->metrics->GetIdleWakeupsPerSecond());
#else
    
    
    
    cpu_dict.Set("idleWakeupsPerSecond", 0);
#endif
    pid_dict.Set("cpu", cpu_dict);
    pid_dict.Set("pid", process_metric.second->pid);
    pid_dict.Set("type", content::GetProcessTypeNameInEnglish(
                             process_metric.second->type));
    result.push_back(pid_dict);
  }
  return result;
}
v8::Local<v8::Value> App::GetGPUFeatureStatus(v8::Isolate* isolate) {