Transformer events

[vatsake]

Hi

First of all, the library is amazing, great work!

I need to listen to transform events, but there's no transformstart, transform and transformend events available on ko-transformer component.

As a workaround I did this:

<ko-transformer #transformer></ko-transformer>

import { viewChild } from '@angular/core'
transformer = viewChild<any>('transformer')

ngAfterViewInit() {
  this.transformer()
    .getNode()
    .addEventListener('transform', (e: any) => console.log(e))
}