Add SwiftUI support for QRScanner framework

[hitsubunnu]

Summary

This PR adds comprehensive SwiftUI support to the QRScanner framework, enabling seamless integration with modern iOS applications built using SwiftUI.

Key Features

• SwiftUI Wrapper: New QRScannerSwiftUIView that implements UIViewRepresentable to bridge the existing UIKit-based QRScannerView to SwiftUI
• Modern Architecture: Utilizes Swift's MainActor for thread-safe UI updates instead of legacy DispatchQueue.main.async
• Complete Sample App: Added QRScannerSwiftUISample demonstrating real-world usage patterns
• iOS 14+ Support: Updated minimum deployment target from iOS 10.0 to iOS 14.0 to support modern SwiftUI features
• Type-Safe Configuration: Comprehensive configuration options with sensible defaults

Technical Implementation

SwiftUI Integration

• QRScannerSwiftUIView acts as a bridge between UIKit and SwiftUI
• Implements proper lifecycle management with @Binding properties
• Supports all existing QRScanner configuration options
• Provides callback-based event handling for scan results and errors

Modern Swift Concurrency

• Replaced DispatchQueue.main.async with Task { @MainActor in } for better performance
• Type-safe main thread updates for UI state changes
• Improved integration with SwiftUI's reactive architecture

Project Structure

• Added SwiftUI wrapper to main QRScanner framework
• Created standalone SwiftUI sample application
• Updated workspace to include both UIKit and SwiftUI samples
• Maintained backward compatibility with existing UIKit implementation

Usage Example

import SwiftUI
import QRScanner

struct ContentView: View {
    @State private var isScanning = true
    @State private var isTorchOn = false
    
    var body: some View {
        QRScannerSwiftUIView(
            configuration: .init(isBlurEffectEnabled: true),
            isScanning: $isScanning,
            torchActive: $isTorchOn,
            onSuccess: { code in
                print("QR Code scanned: \(code)")
            },
            onFailure: { error in
                print("Scanner error: \(error.localizedDescription)")
            }
        )
    }
}

Breaking Changes

iOS Deployment Target: Minimum iOS version increased from 10.0 to 14.0

• This change enables SwiftUI support and modern Swift concurrency features
• Affects all package managers: CocoaPods, Swift Package Manager, and manual integration
• Developers targeting iOS versions below 14.0 should continue using previous versions

Test Plan

• SwiftUI sample app builds and runs successfully
• QR code scanning functionality works in SwiftUI environment
• Torch toggle functionality operates correctly
• Camera permission handling works as expected
• Framework builds successfully with updated deployment target
• Existing UIKit sample continues to function normally
• Swift Package Manager integration updated
• CocoaPods specification updated

Compatibility

• iOS 14.0+: Full SwiftUI support with all features
• Existing UIKit code: No changes required, fully backward compatible
• Package Managers: Updated specifications for CocoaPods and SPM

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