Adding abstract GridDF (#32)

* adding normalization to mixin

* adding GridDF

* adding properties to docstrings

* add numpy's warning, remove type_checking (handled in get_neighborhood)

Author: adamamer20

mesa_frames/abstract/mixin.py

@@ -198,6 +198,9 @@ def _df_get_masked_df(
     @abstractmethod
     def _df_iterator(self, df: DataFrame) -> Iterator[dict[str, Any]]: ...
 
+    @abstractmethod
+    def _df_norm(self, df: DataFrame) -> DataFrame: ...
+
     @abstractmethod
     def _df_remove(
         self, df: DataFrame, ids: Sequence[Any], index_col: str | None = None