macos/screencapturekit: add support with TCC error handling and example

[tmc]

This PR adds support for Apple's ScreenCaptureKit framework to DarwinKit with comprehensive TCC (Transparency, Consent, and Control) permission handling.

Features

Core Screenshot Functionality

• SCScreenshotManager for taking screenshots
• Proper error handling via SCError type
• Modern DarwinKit API design using objc.Call pattern

TCC Permission Handling

• Comprehensive error detection for TCC-related issues
• Helper methods to identify and handle permission errors
• User-friendly guidance for resolving permission problems
• System Preferences integration for easier permission granting
• Automatic retry mechanism for temporary permission issues

Additional Types

• SCStreamConfiguration for screen capture configuration
• SCContentFilter for filtering capture content
• SCDisplay and SCWindow type definitions for future expansion

Example Application

• Added screenshot example demonstrating proper usage
• Shows permission handling with retry logic
• Provides user guidance for resolving permission issues
• Saves screenshots to the desktop

Usage Example

// Basic usage
manager := screencapturekit.SCScreenshotManager_SharedManager()
manager.CaptureScreenshotWithCompletion(func(image appkit.Image, err screencapturekit.SCError) {
    if \!err.IsNil() {
        fmt.Printf("Error: %v\n", err)
        return
    }
    // Process the image...
})

// With retry logic for TCC permission issues
manager.CaptureScreenshotWithRetry(3, time.Second, func(image appkit.Image, err screencapturekit.SCError, success bool) {
    if \!success {
        if err.IsTCCError() {
            fmt.Println(err.GetPermissionInstructions())
            screencapturekit.OpenSystemPreferencesTCC()
        }
        return
    }
    // Process the image...
})

[progrium]

claude generated? if we ran clobber and this package was deleted, how would it be regenerated?