Add new Key Takeaways Feature

[dkotter]

Description of the Change

This PR adds in a new Feature, called Key Takeaways, that when enabled and configured, introduces a new Key Takeaways block.

This block can only be added once per post and when inserted, will send a request off to the configured Provider to generate the key takeaways of the content and render those as either bullets or paragraphs, depending on the setting in the block. This can be toggled back and forth after the key takeaways have been generated. The key takeaways can also be edited inline or removed.

It also renders a title for this block (defaults to Key Takeaways) that can be edited or deleted altogether. And we have a Refresh button in the sidebar settings for the block, allowing you to regenerated the key takeaways at any point.

Closes #505

Screenshots

How to test the Change

1. Enable the new Key Takeaways Feature
2. Configure this to use OpenAI or Azure OpenAI
3. Go to an existing post that has content (or create a new one) and add the Key Takeaways block
4. Ensure this block loads in content
5. Ensure the content renders both in the editor and on the frontend
6. Try refreshing the results from the sidebar and ensure that works
7. If desired, try adding a custom prompt to test that functionality

Changelog Entry

Added - New Feature, Key Takeaways, that adds a new block that will generate and output the key takeaways for that post, allowing visitors to get a quick overview of the content without having to read it all.

Credits

Props @dkotter, @jeffpaul

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.

[jeffpaul]

Solid work on a Friday!!!