Image block should use LazyLoad (or at least be able to do so)

[JohnnyMcWeed]

What steps will reproduce the problem?

Use image block

What is the expected result?

LazyLoad or option for it

What do you get instead? (A Screenshot can help us a lot!)

No LazyLoad at all

[nadar]

Could you make an example?

[JohnnyMcWeed]

Currently the image block view (https://github.com/luyadev/luya-bootstrap4/blob/master/src/views/blocks/ImageBlock.php) is not using Luya's LazyLoad. This could improve the overall performance of a site.
Therefore this should be either implemented by default or having a block option to use it (https://github.com/luyadev/luya-bootstrap4/blob/master/src/blocks/ImageBlock.php).
(Related to luyadev/luya#2031 as "alt" and "title" attributes should be there aswell :) )

[nadar]

A configuration option would be great, yes! Would you like to send a PR?

[JohnnyMcWeed]

I'll go for it as soon as the LazyLoad is ready, so we can integrate the attributes at the same time :)