Ability to tag images in Contentful

[hokienick]

As the quest to become accessibility compliant, we will need images to be tagged on the page so that a screenreader can "read" it.

There are two way images appear in our page: <img> tags and "Choose Image" in Contentful. We will need ways to include tags in both scenarios.

[kkartunov]

@hokienick
Nice reference to follow https://www.oomphinc.com/notes/2019/01/images-alt-tags-out-loud-experience-oomph-inc/

For <img> we do support all attributes which include alt as well.
For "Choose Image" we need to add image tags field below it, correct?

[kkartunov]

demo: https://community-app.topcoder.com/examples/contentful/viewport/5CG0ObzaFavsxSAqYviNol
source: https://app.contentful.com/spaces/b5f1djy59z3a/entries/5CG0ObzaFavsxSAqYviNol

[kkartunov]

Done with 32b8f50