text: Title: `CallbackData` usage example
  Body: ### aiogram version
  
  3.x
  
  ### Problem
  
  Let's assume I'm a newbie in aiogram. I see its awesome feature called "`CallbackQuery.data` parsing" and I don't know how to use it properly. I try to read the docs and still encounter some problems, so I need a code to compare with mine.
  
  ### Possible solution
  
  Port and adapt `callback_data_factory` example from 2.x to 3.x. Optionally improve it with new features.
  
  ### Alternatives
  
  _No response_
  
  ### Code example
  
  _No response_
  
  ### Additional information
  
  This issue is more about adding an example to `examples/` directory of repo rather than the example request itself. I'm already using `CallbackData` class at its 100% potential in my projects, so I, personally, don't need it.