Improve input property in NzDrawerRef

[kiyonlin]

What problem does this feature solve?

Now we can not dynamically set nzFooter and nzOnCancel in NzDrawerRef.
Related to #2464

What does the proposed API look like?

export class NzDrawerCustomComponent {
  constructor(private drawerRef: NzDrawerRef<string>) {
    drawerRef.nzFooter = this.templateRef;
    drawerRef.nzOnCancel = () => Promise;
  }
}

[GeryStoycheva]

Hello, I'm also interested in this feature. Will it be implemented soon?