addSingletonCallback abstract method

Add a callback to be executed when the singleton associated with name is initialized.

This method allows registering callbacks that will be executed when a singleton is initialized. The callback will receive the singleton instance as its parameter.

name: The name of the singleton to register the callback for callback: The callback to execute when the singleton is initialized

Throws:

• IllegalArgumentException if name is null or empty
• PodNotFoundException if no singleton exists with the given name

Example:

singletonRegistry.addSingletonCallback('userService', (userService) {
  print('UserService initialized: $userService');
});