Revisit image component

[jurgenbelien]

Image component in ImageBlock and TextImageBlock does not load the optimal image, due to missing exposed sizes property.

[jurgenbelien]

Additional enhancements that are possible:

• Possible onload="this.style.backgroundImage = 'none'; inline behavior for clearing the background Image. (Would this be allowed from a CSP-perspective?)
• add height for getImageSrcSet for correct cropping:

    const getImageSrcSet = (url: string) => {
      return defaultSrcSetSizes.map((size) => {
        const src = getImageSrc(url, {
          w: size,
          ...(responsiveImageSrcHeight
            ? { h: size / responsiveImageAspectRatio }
            : {}),
          });
          return `${src} ${size}w`;
        }).join(', ');
    };