Feature/olme/add webp support
- created an Image and Media Object DTO
- the DTO converts its source to the defaultFileFormat from avalley config
- and generates a source set for a given breakpoints array (from avalley config)
- added a blade component and view for rendering sourcesets
- updated placeholder replacement
- single placeholders are getting replaced by an ImageObject DTO
- multiple placeholders and custom wrapper markup is getting passed through to the blade view