[gatsby-plugin-image] allow aria attributes when used as link

[ThomasRutzer]

Hi,

if I use GatsbyImage inside a <a />, I need aria-hidden attribute added to its wrapper to make it most accessible. By now, this html attributes is not possible, so I need another surrounding element. Would be nice to optimize so I don`t need another element.

My structure so far is something like that:

<a href="/test" target="_blank" class="link" rel="noopener noreferrer">
  Learn more
  <span aria-hidden="true">
     <GatsbyImage {...props} />
  </span>
  <span class="sr-only">(opens in new tab)</span>
</a>

Or is anyone else having a better solution for that?