feat(modal): [ios] dismissOnSwipeDown property

[mateoguzmana]

Summary:

Fixes #29319

This PR combines two fixes:

• Currently, dismissing the modal by swiping down doesn't seem to work in Fabric. Probably was not ported over.
• The only option to dismiss the modal available right now in Paper, always "stops" at the beginning before fully dragging down and there is no way to change that. This prop gives the option to allow fully dragging down.

This prop defaults to false to avoid introducing breaking changes. Fully optional.

Changelog:

[IOS] [ADDED] - Modal dismissOnSwipeDown property

Test Plan:

Video recording demonstrating how the prop behaves

420Screen.Recording.2024-11-05.at.00.46.58.mov

[mateoguzmana]

Well, while opening the PR, I found out there are other two PRs trying to solve a similar issue but not much activity on them lately – weren't linked to any of the issues I was tracking down so a bit easy to miss.

Leaving them here as reference:

• Allows interactive dismissal of modals on iOS #42309
• Implement interactive dismiss for iOS modals #38641

Happy to help getting the ball rolling in any of them as well.

[mateoguzmana]

Closing in favour of the PRs that are still currently open aiming to fix the same issue