Explore having the LLM return content in JSON schema instead of WordPress block markup

[dkotter]

Description of the Change

For the Content Generation Feature, we specify in our prompt that the content returned should follow the WordPress block markup (with some examples). This seems to work but is fairly fragile as it relies on the LLM knowing what this block markup should look like.

There's a few alternatives to that approach and this PR is exploring one of those: having the LLM return content formatted as JSON and then having us parse that into valid block markup. In theory this should be more reliable and does open up a path where we could support a wider-range of block types (for example, blocks specific to a site or that come from a plugin that some sites may be using).

Some of the work here comes from the @10up/block-renderer-core package (I was wanting to use the full suite but ran into issues getting that working in the block editor cc / @fabiankaegy). Our prompt is still static so won't include custom blocks but we now ask for things formatted as JSON and then parse that on the client-side to create our blocks.

How to test the Change

1. Checkout this branch and run npm i && npm run build
2. Turn on the Content Generation Feature and configure it correctly
3. Create a new post and then click on the sparkle icon in the lower right corner of the editor
4. In the box that opens up, add your article summary you want to generate (i.e. brief history of WordPress)
5. Send that request off and ensure you see valid results rendered
6. Ensure you can insert that content into the editor and it renders properly there

Changelog Entry

Changed - For our Content Generation Feature, have the LLM return JSON data instead of block markup and then parse that out ourselves

Credits

Props @fabiankaegy, @dkotter

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.

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