Mod: Update workflow python version and add num_rows and num_columns …

…for AACDataset base class.

.github/workflows/python-package-pip.yaml

@@ -23,7 +23,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
     # --- INSTALLATIONS ---

src/aac_datasets/datasets/base.py

@@ -105,13 +105,23 @@ def flat_captions(self) -> bool:
         """Returns true if captions has been flattened."""
         return self._flat_captions
 
+    @property
+    def num_columns(self) -> int:
+        """Number of columns in the dataset."""
+        return len(self.column_names)
+
+    @property
+    def num_rows(self) -> int:
+        """Number of rows in the dataset (same as len())."""
+        return len(self)
+
     @property
     def raw_data(self) -> Dict[str, List[Any]]:
         return self._raw_data
 
     @property
     def shape(self) -> Tuple[int, int]:
-        """The shape of the dataset."""
+        """Shape of the dataset (number of columns, number of rows)."""
         return len(self), len(self.column_names)
 
     @property