feat(gallery): add grid display - FRONT-4459

[emeryro]

• alternative display using css grid. Twig parameter: grid
• when in grid display, added possibility to change number of column and aspect ratio. Twig parameters column and ratio

[github-actions]

🚀 Deployed on https://ecl-preview-3434--europa-component-library.netlify.app

[planctus]

The columns control doesn't seem to do anything, i see the reason why, the css is missing an & for the columns selectors

@include breakpoints.up('m') {
  .ecl-gallery--grid {
    .ecl-gallery__list {
      grid-template-columns: repeat(3, 1fr);
    }

    .ecl-gallery--col-2 {
      .ecl-gallery__list {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    .ecl-gallery--col-4 {
      .ecl-gallery__list {
        grid-template-columns: repeat(4, 1fr);
      }
    }
  }
}

[planctus]

we set the default to 3 for the column..

[planctus]

same here for the ratio, it cannot be empty, basically..