use ABC for force_df_out feature

[AlexandreGazagnes]

    def __init__(
        self,
        bool_cols: list[str] | None = None,
        force_df_out: bool = False,
    ) -> None:
        """init method"""

        self.bool_cols = bool_cols
        self.force_df_out = force_df_out

self.force_df_out = force_df_out => ABCClass