29764 Fix “google-objc-*” clang analyzer warning in macOS and iOS (platform-ios, cla: yes, waiting for tree to go green, platform-macos)

29827 Add ‘explicit’ to darwin embedder constructors (platform-ios, cla: yes, waiting for tree to go green, platform-macos, needs tests)

29828 Fix darwin namespace-comments and brace lint issues (platform-ios, cla: yes, waiting for tree to go green, platform-macos)

29856 Extract AccessibilityBridge::kRootNodeId (cla: yes, platform-macos, needs tests)

30005 [macOS] MacOS Keyboard properly handles multi-char characters (cla: yes, platform-macos)