Support for Block Content

I've added a matcher to handle block_content. Let me know if any changes are needed!

Thanks,
Thiemo

For my own understanding, is the idea that Linkit for block_content would be used more like an entity reference field rather than a link field? In other words, I am assuming that since block_content is a Drupal entity type that does not have dedicated URI routes, block_content cannot be "linked" to in the traditional sense, so the Linkit widget here would be useful only for providing an entity ID lookup so that block_content could be rendered within another entity?