Scully-plugin-lazy-load-picture-tag

I wrote this as an :paperclip: `angular-paperclip` :paperclip: experiment from the talk by **Misko Hevery (@mhevery)** from the [Keynote in NGCONF 2019](https://nitayneeman.com/posts/all-talks-from-ng-conf-2019/#keynote-1)