[feature]: improve intake item creation API

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Summary

Improve /v1/ API for Creating Intake Items.
When using the API it's possible to create an intake work item with Title, Description or Description HTML and Priority Status. Some components that could be added would be:

• Add Labels support
• Add Assignes support

It would be also important to update the API docs, as it's already behind. It states it's only possible to create with a title, but now we can actually add a Priority and description as well.

Why should this be worked on?

This update would significantly improve API completeness, efficiency, and adoption. By allowing labels and assignees to be defined at creation time, teams can automate intake workflows end-to-end without relying on additional API calls or manual intervention and more alignment with work item creation API.