Qiscus Chat SDK for Flutter

• fix error on appconfig failing setup process
• fix not sending ajax request after updating to dio 4.0
• [internal] support for generating AppConfig from Storage
• updating some dependencies to latest version and removing least used dependencies
  • mqtt_client: ^6.0.0 -> ^9.4.2
  • dio: ^3.0.8 -> ^4.0.0
  • equatable: ^1.1.1 -> ^2.0.3
  • get_it: ^4.0.2 -> ^7.0.0
  • async: ^2.4.1 -> ^2.5.0
  • meta: removed