message: refactor(skip): skip is just filtering by index
diff: /** @prettier */
  import { MonoTypeOperatorFunction } from '../types';
  -import { operate } from '../util/lift';
  -import { OperatorSubscriber } from './OperatorSubscriber';
  +import { filter } from './filter';
  /**
  * Returns an Observable that skips the first `count` items emitted by the source Observable.
  @@ -35,8 +34,5 @@ import { OperatorSubscriber } from './OperatorSubscriber';
  * @name skip
  */
  export function skip<T>(count: number): MonoTypeOperatorFunction<T> {
  - return operate((source, subscriber) => {
  - let seen = 0;
  - source.subscribe(new OperatorSubscriber(subscriber, (value) => (count === seen ? subscriber.next(value) : seen++)));
  - });
  + return filter((_, index) => count <= index);
  }
  