[frontend-api] Entity images can now be loaded via fronted API

[TomasLudvik]

Q	A
Description, reason for the PR	Images are necessary part of e-commerce solutions. This PR enabled possibility to load images of all current entities with images.
New feature	Yes
BC breaks	No
Fixes issues	...
Have you read and signed our License Agreement for contributions?	Yes

[henzigo]

Hello, can I call only one request for more images for same entityType?

For example, I have 24 products on product list, but I do not want to call 24 requests to get images for that.

[TomasLudvik]

Hello, can I call only one request for more images for same entityType?

For example, I have 24 products on product list, but I do not want to call 24 requests to get images for that.

You do not have to, you can call it in query for all products.

[s3tezsky]

I'm fine with it but still left a few comments.

And I would like to suggest add unit tests at least for ImageResolver. Also I am still thinking if ImageResolver should not be abstract class 🤔

[s3tezsky]

when I send the query bellow, API will respond with HTML of 500 error page probably caused by cached files... everything as expected

{
  product(uuid: "foo") {
    images {
      url,
      type,
      size,
      width,
      height,
      position
    }
  }
}