dev: block model compatibility

[justlevine]

What

Experimental compatibility with rtCamp/wp-graphql-content-blocks#31

Why

Related Issue(s):

• https://github.com/rtCamp/headless/issues/234

How

Testing Instructions

Screenshots

Additional Info

Important

Make sure to remove the existing local copy of wp-graphql-content-blocks and run npm run install-test-env to get the experimental plugin branch from rtCamp/wp-graphql-content-blocks#31

Checklist

• I have read the Contribution Guidelines.
• My code is tested to the best of my abilities.
• My code passes all lints (PHPCS, PHPStan, ESLint, etc).
• My code has detailed inline documentation.
• I have added unit tests to verify the code works as intended.
• I have updated the project documentation accordingly.