We don't support bundling or redistributing the premium versions of Beaver Builder with a theme, but you're free to do this with the free version.
There are several helpful features for theme authors bundling the free version of Beaver Builder with a theme. You can include an affiliate link via a filter, so if anyone upgrades Beaver Builder after learning about it from your theme, you'll get a 25% commission on the sale. We also have a feature that enables theme authors to build and include pre-designed templates with their theme.
For more information, see this blog post about bundling the free version of Beaver Builder or this Knowledge Base article about our theme author templates feature.