feat: Implement exitApp in iOS

[bcastro-mcm]

This pull request introduces a change in the Ionic Capacitor plugin for iOS to ensure a smoother and more reliable app termination process. The updated implementation delays the suspension and exit calls, reducing the risk of premature termination issues.

Changes Introduced

• Added a delay of 0.2 seconds using DispatchQueue.main.asyncAfter before calling UIApplication.shared.perform(#selector(NSXPCConnection.suspend)).
• Introduced an additional 0.2-second delay before executing exit(0) to ensure proper app suspension prior to termination.

Reason for the Change

• This change addresses potential issues with abrupt app termination on iOS devices, ensuring:
• All necessary background operations or state-saving mechanisms have sufficient time to complete before suspension.
• A smoother user experience during app closure.

Code Change

DispatchQueue.main.asyncAfter(deadline: .now() + 0.2) {
    UIApplication.shared.perform(#selector(NSXPCConnection.suspend))
    DispatchQueue.main.asyncAfter(deadline: .now() + 0.2) {
        exit(0)
    }
}

Testing

• Verified the app termination process on multiple iOS devices to confirm:
• The app suspends and exits gracefully.
• No crashes or unexpected behavior during termination.

Impacts

• This change affects the app termination process in iOS only.
• No impact on Android or other platforms.