Add Open Graph helper functions

[raed667]

Describe the feature

Similar to page.title() some open graph helper functions could be extremely helpful.

Example inspirations:

1. open-graph-scraper https://www.npmjs.com/package/open-graph-scraper
2. open-graph https://www.npmjs.com/package/open-graph
3. fetch-opengraph https://www.npmjs.com/package/fetch-opengraph

If you're open for a PR that implements this, I can give it a shot.

[mnmkng]

It's related to this old issue: #276 I think it's worth it to have those parsers inside Crawlee. If you can write the extractors, we can help you integrate it. We could most likely expose it in the crawling contexts so the functions are aware of the current page.