Enhancement(macOS): macOS support API change to allow App Sandbox mode

[emile-o]

macOS support API now uses the "LaunchAtLogin" Swift package, thereby allowing App Sandbox mode to be enabled for publishing.

BREAKING CHANGES:

• Additional code needs to be added to the MainFlutterWindow.swift file for platform channel communication and additional configurations are also required to be made via Xcode for the Runner project.

Changes:

• AppAutoLauncherImplMacOS changed to use new API using Dart Swift platform channels
• README.md updated with installation instructions for new macOS support API. Includes rudimentary Chinese (simplified) translation for README-ZH.md

Example Project Changes:

• Code added to MainFlutterWindow.swift to import LaunchAtLogin module and handle Dart Swift platform channel communication
• App Sandbox enabled for Debug, Profile and Release modes in Xcode
• Configurations and LaunchAtLogin package added to Xcode Runner project for new API
• Select packages in pubspec.yaml upgraded by several major versions as old versions were quite outdated and causing issues in the builds

Additional changes:

• Package pubspec.yaml flutter_lints upgraded
• Deprecated methods in Tests fixed

Related to issue https://github.com/leanflutter/launch_at_startup/issues/1