Reduce or allow customizing dropdown delay

What problem does this feature solve?

https://github.com/NG-ZORRO/ng-zorro-antd/blob/7071edd3f72d3384ec73a329fd0d9dce3af67fc5/components/dropdown/dropdown.directive.ts#L147

We had reports about dropdowns feeling "stuck" or seemingly broken. Obviously they are not broken, but the 150ms lag causes users to believe that. Is there any chance the delay could be customizable (e.g., per-application as a starting point)?

What does the proposed API look like?

A global customization via provideNzConfig.