NzFlex - Support for reverse flex direction

[dibfibo]

What problem does this feature solve?

With nz-flex, it isn't possible to set reverse flex direction. It is a restriction that cause devs to incapulate(wrap) nz-flex in a custom component.Now i have something like this.
Logic:
vertical = input(true, {...})
reverse = input(false, {...})
protected flexClass = () => ({reverse: this.reverse()})

Template =
<nz-flex [ngClass]="flexClass" >...

In a scss i overwrite default flex direction using ng-deep inside host selector for nz-flex.reverse element.

What does the proposed API look like?

It can be a boolean input "reverse", alias "nzReverse", to maintain compatibiliy with vertical input.