Prepare for new block variations 3/x: block variation loading

[carstingaxion]

Preparation to bring some block variations from the gatherpress-block-playground into the plugin as part of #626.

While current blocks can rely on register_block_type() to get everything in place, block variations need more manual attention.

Description of the Change

With this PR, I try to outline a possible way to load all variations the same way.

Because most of the variations need some extra php to work, I went with a singleton, that gets automatically copied from /src to /build and lives in the folder of the variation. For this reason the autoloader doesn’t know about the classes and that’s why I required them manually.

Could this be done nicer @mauteri ??

Closes #

How to test the Change

Changelog Entry

Added - Generalized the loading of block-variations

Credits

Props @carstingaxion

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests pass.

[carstingaxion]

He @mauteri could you please take a look at this idea of how to load the variations?

I based this branch on the work of #888, that’s why there are so many commits, but if possible, only focus on the last three four commits. And don’t forget about the PR description ;)

thanks.

[github-actions]

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