feat: Add support for managing sheet detents with imperative API

[Crysp]

Introduced a sheetRef prop and associated commands for controlling sheet detents on formSheet presentations. This includes native methods and type definitions to set the detent index programmatically, improving customization and flexibility.

Description

This feature allows to control active detent of opened formSheet. Sometimes it is really useful to set detent programmatically

Changes

• Screens handles UI commands via react reference (like SearchBar)

Demonstration

iOS	Android
ios.mov	android.mp4

Checklist

• Included code example that can be used to test this change.
• Updated / created local changelog entries in relevant test files.
• For visual changes, included screenshots / GIFs / recordings documenting the change.
• For API changes, updated relevant public types.
• Ensured that CI passes