Add better nutrition parsing for cookwell.com

[eric-hoffmann]

Cookwell.com only provides calorie information in the recipe metadata, but additional nutrition information is embedded in one of the page's scripts. This change searches the script tags for the matching information and extracts it. If it cannot find the information, it will default to the calorie only information provided in the metadata. I've tested this with a few random recipes from the site and observed it working as expected.

from urllib.request import urlopen
from recipe_scrapers import scrape_html
url = "https://cookwell.com/recipe/crispy-oven-fries"
html = urlopen(url).read().decode("utf-8")
scraper = scrape_html(html,url)
scraper.nutrients()

{'calories': '970 calories', 'carbohydrateContent': '100 g', 'fatContent': '60 g', 'proteinContent': '12 g'}

...
url = "https://cookwell.com/recipe/lahmacun"
...
scraper.nutrients()

{'calories': '2558 calories', 'carbohydrateContent': '402 g', 'fatContent': '49 g', 'proteinContent': '132 g'}

[jknndy]

Thanks for the contribution, this is a welcome improvement! I made a few small proposed changes for your review but looks great. Thanks!

[hhursev]

GTJ