[Merl-862] Add support for Classic Blocks

[theodesp]

Description

This PR adds support for querying Classic Blocks. Since those blocks are not stored in the database with a proper name we assign them a name now and resolve them as CoreFreeForm returning the contents of the innerHTML as long as the contents are not empty.

Screenshots

Testing

1. Create a Classic block in a post
2. Query for the content attribute in editor blocks.
3. Block should resolve as CoreFreeForm as plain HTML.

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Latest commit: f19edcd

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[josephfusco]

Looks good!