Add WP-CLI command to bulk process OpenAI Embeddings

[phpbits]

Description of the Change

In 437 we added a feature to classify content within your existing content structure using the OpenAI Embeddings API. This PR adds the WP CLI script to do bulk embeddings using the command below:

wp classifai embeddings

and has the following options:

• A comma-delimited list of post IDs to process
• A per_page argument. This controls how many items we process in each batch. Defaults to 100. As an example, if you have 1000 items to process, all of these will be processed but will be done in batches of 100 for performance reasons
• A post_type argument that defaults to post. Will only process items that belong to the defined value.
• • A post_status argument that defaults to publish. Will only process items that belong to the defined value.
• A dry-run argument that defaults to true. You must pass false to actually run the command

Changelog Entry

Added - Custom WP-CLI command that can be used to run Embeddings processing

Credits

Props @phpbits

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.

[phpbits]

@jeffpaul @dkotter This functionality is now ready for code review. Thanks!