feat: Add advanced hierarchical console output recorder for Swift Testing

- Implement Event.AdvancedConsoleOutputRecorder with beautiful tree structure
- Add SF symbols support with colors (play.circle, checkmark.circle, x.circle, etc.)
- Right-aligned timing display with 80-column fixed width
- Unicode box-drawing characters for hierarchical test output
- Issues displayed as sub-nodes under failed tests
- Enhanced start message with test count and running status
- Thread-safe parallel execution support
- Color-coded final summary with status icons
- Replace basic ConsoleOutputRecorder with enhanced version
- Add demo test files for validation

Features:
✅ Hierarchical tree structure with proper indentation
✅ SF Symbols on macOS with Unicode fallback
✅ Right-aligned timing information
✅ Color-coded status icons and output
✅ Issues as expandable sub-nodes
✅ Enhanced start/end messages
✅ Thread-safe concurrent test execution

Author: tienquocbui

Sources/Testing/ABI/EntryPoints/EntryPoint.swift

@@ -54,12 +54,18 @@ func entryPoint(passing args: __CommandLineArguments_v0?, eventHandler: Event.Ha
 #if !SWT_NO_FILE_IO
     // Configure the event recorder to write events to stderr.
     if configuration.verbosity > .min {
-      let eventRecorder = Event.ConsoleOutputRecorder(options: .for(.stderr)) { string in
+      // Use the advanced console output recorder for hierarchical display
+      var advancedOptions = Event.AdvancedConsoleOutputRecorder.Options()
+      advancedOptions.base = .for(.stderr)
+      advancedOptions.useHierarchicalOutput = true
+      
+      let eventRecorder = Event.AdvancedConsoleOutputRecorder(options: advancedOptions) { string in
         try? FileHandle.stderr.write(string)
       }
-      configuration.eventHandler = { [oldEventHandler = configuration.eventHandler] event, context in
-        eventRecorder.record(event, in: context)
-        oldEventHandler(event, context)
+      
+      // Replace the event handler completely with our advanced recorder
+      configuration.eventHandler = { event, context in
+        eventRecorder.handle(event, in: context)
       }
     }
 #endif