WebP support

[PiotrOstrowski1311]

What is the expected behavior?

are you going to implement webp format in ngx-gallery ?

What is the current behavior?

What are the steps to reproduce?

What is the use-case or motivation for changing an existing behavior?

Which versions are you using for the following packages?

Angular: 11 Typescript: 4.2 Gallery: last version

Is there anything else we should know?

[vpetrusevici]

I use this lib with webp images without any problems