text: Title: Add as_caption_kwargs() method to aiogram.utils.formatting.Text
  Body: ### aiogram version
  
  3.x
  
  ### Problem
  
  Methods like `Bot.send_document() ` use `caption` and `caption_enteties` parameters instead of `text` and `entities`. That results in repeating `Text(...).as_kwargs(text_key="caption", entities_key="caption_entities")` calls.
  
  ### Possible solution
  
  I suggest introducing a shortcut method `as_caption_kwargs()` or something like that 
  
  ### Alternatives
  
  _No response_
  
  ### Code example
  
  ```python3
  
  ```
  
  ### Additional information
  
  _No response_