Import schema.org microdata recipe format

[dubadub]

We already support similar import in schema.org JSON-LD format, but some web-sites export recipe data only in microdata format. We can get inspiration from a fellow project https://github.com/julianpoy/RecipeClipper/blob/master/src/utils/microdata.js.

Example recipe:

<div itemscope itemtype="https://schema.org/Recipe">
  <span itemprop="name">Mom's World Famous Banana Bread</span>
  By <span itemprop="author">John Smith</span>,
  <meta itemprop="datePublished" content="2009-05-08">May 8, 2009
  <img itemprop="image" src="bananabread.jpg"
       alt="Banana bread on a plate" />

  <span itemprop="description">This classic banana bread recipe comes
  from my mom -- the walnuts add a nice texture and flavor to the banana
  bread.</span>

  Prep Time: <meta itemprop="prepTime" content="PT15M">15 minutes
  Cook time: <meta itemprop="cookTime" content="PT1H">1 hour
  Yield: <span itemprop="recipeYield">1 loaf</span>
  Tags: <link itemprop="suitableForDiet" href="https://schema.org/LowFatDiet" />Low fat

  <div itemprop="nutrition"
    itemscope itemtype="https://schema.org/NutritionInformation">
    Nutrition facts:
    <span itemprop="calories">240 calories</span>,
    <span itemprop="fatContent">9 grams fat</span>
  </div>

  Ingredients:
  - <span itemprop="recipeIngredient">3 or 4 ripe bananas, smashed</span>
  - <span itemprop="recipeIngredient">1 egg</span>
  - <span itemprop="recipeIngredient">3/4 cup of sugar</span>
  ...

  Instructions:
  <span itemprop="recipeInstructions">
  Preheat the oven to 350 degrees. Mix in the ingredients in a bowl. Add
  the flour last. Pour the mixture into a loaf pan and bake for one hour.
  </span>

  140 comments:
  <div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter">
    <meta itemprop="interactionType" content="https://schema.org/CommentAction" />
    <meta itemprop="userInteractionCount" content="140" />
  </div>
  From Janel, May 5 -- thank you, great recipe!
  ...
</div>