feat: add `allowCaption` option to image fields

[angeloashmore]

[!IMPORTANT] Do not merge this PR. It is a proof-of-concept.

Context

DT-2008

The Solution

• Use an alpha version of @prismicio/types-internal that includes the allowCaption image field option.
• Add the allowCaption form field to the image widget.
• Adjust the edit dialog to render the checkbox in a reasonable location.

[!NOTE] Since this is a proof-of-concept PR and will not be merged, we can ignore the failing Playwright test.

Impact / Dependencies

This PR allows developers to configure image fields with a caption. The page builder needs to be updated to read this option.

Checklist before requesting a review

• [ ] I hereby declare my code ready for review.
• [ ] If it is a critical feature, I have added tests.
• [ ] The CI is successful.
• [ ] If there could backward compatibility issues, it has been discussed and planned.

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Name	Status	Preview	Updated (UTC)
slice-machine	✅ Ready (Inspect)	Visit Preview	Mar 21, 2024 0:56am

[linear[bot]]

DT-2008 AAUser I can allow caption for the image field in Slice Machine

[angeloashmore]

Closing since this was just a proof of concept.