refactor(Android, FormSheet v5): Extract FormSheetLifecycleCoordinator for cleaner dialog event handling

[t0maboro]

Description

Part 1 for refactoring FormSheetDialogManager architecture on Android. This PR extracts the native dialog lifecycle management into a dedicated class.

Changes

• moving onShow, onDismiss, and backdrop click handling to register on FormSheetLifecycleCoordinator level

Before & after - visual documentation

N/A - refactor

Test plan

N/A - refactor

Checklist

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

[Copilot]

Pull request overview

This PR refactors the Android FormSheet (v5) implementation by extracting dialog lifecycle event wiring (show/cancel/backdrop click) from FormSheetDialogManager into a dedicated FormSheetLifecycleCoordinator, aiming to simplify responsibilities and improve maintainability.

Changes:

• Introduced FormSheetLifecycleCoordinator to centralize BottomSheetDialog show/cancel handling and dimming backdrop click wiring.
• Updated FormSheetDialogManager to delegate lifecycle listener setup/teardown to the new coordinator.
• Removed now-redundant private listener-setup methods from FormSheetDialogManager.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
android/src/main/java/com/swmansion/rnscreens/gamma/modals/formsheet/FormSheetLifecycleCoordinator.kt	New coordinator class encapsulating dialog show/cancel + backdrop click listener management.
android/src/main/java/com/swmansion/rnscreens/gamma/modals/formsheet/FormSheetDialogManager.kt	Delegates lifecycle listener responsibilities to the new coordinator and removes duplicated logic.

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