Move SparseDataComponentType to _core/data_types.py and update docstring in data_types.py

Signed-off-by: Emanuele Brentegani <emabr90@gmail.com>

Author: emabre

src/power_grid_model/_core/data_types.py

@@ -160,6 +160,13 @@ class SparseBatchArray(TypedDict):
 Sparse batch data can be a :class:`SparseBatchArray` or a :class:`SparseBatchColumnarData`.
 """
 
+SparseDataComponentType: TypeAlias = str
+"""
+A string representing the component type of sparse data structures.
+
+Must be either "data" or "indptr".
+"""
+
 BatchColumnarData = DenseBatchColumnarData | SparseBatchColumnarData
 """
 Batch columnar data is either a :class:`DenseBatchColumnarData` or a :class:`SparseBatchColumnarData`.

src/power_grid_model/data_types.py

@@ -6,11 +6,9 @@
 Data types involving PGM datasets.
 
 Many data types are used throughout the power grid model project. In an attempt to clarify type hints, some types
-have been defined and explained.
+are defined/exposed and explained.
 """
 
-from typing import TypeAlias
-
 from power_grid_model._core.data_types import (  # pylint: disable=unused-import
     AsymValue,
     AttributeType,
@@ -44,11 +42,5 @@
     SparseBatchArray,
     SparseBatchColumnarData,
     SparseBatchData,
+    SparseDataComponentType,
 )
-
-SparseDataComponentType: TypeAlias = str
-"""
-A string representing the component type of sparse data structures.
-
-Must be either "data" or "indptr".
-"""