Integrate with Beaver Builder

[crbdev]

We already have our sights set on integrating with Elementor (#1920) and Divi (#1919). Beaver Builder is another popular page builder that we should consider integrating with. We would have a custom GravityView module inside Beaver Builder (https://docs.wpbeaverbuilder.com/beaver-builder/developer/custom-modules/).

A power user customer expressed interest in this directly:

It would be amazing if I could build a loop inside of Beaver Builder. Improvements to the UX for the builder are key.