[REFACTOR] Align `@abstractmethod` definition within `argilla`

[alvarobartt]

Is your feature request related to a problem? Please describe.

As of the Python documentation the usage of @abstractproperty is discouraged and deprecated since Python 3.3, so we should stop using those in the first place, replacing them with @property + @abstractmethod.

Then regarding the body of those @abstractmethods we should define an standard way of defining those.

Describe the solution you'd like

• Adding a one-line docstring

  from abc import abstractmethod
  
  class A:
     ...
  
     @abstractmethod
     def implement_me(self) -> None:
        """This is a docstring"""
  

• Adding pass

  from abc import abstractmethod
  
  class A:
     ...
  
     @abstractmethod
     def implement_me(self) -> None:
        pass
  

• Adding ...

  from abc import abstractmethod
  
  class A:
     ...
  
     @abstractmethod
     def implement_me(self) -> None:
        ...
  

[davidberenstein1957]

@frascuchon @jfcalvo @gabrielmbmb

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