[CLN] Use relative imports in manipulate_points module

Switched to relative imports for better modularity and cleaner project structure. This change improves maintainability and aligns with Python's best practices for package organization.

Author: Leguark

gempy/modules/data_manipulation/manipulate_points.py

@@ -2,9 +2,9 @@
 
 import numpy as np
 
-from gempy.core.data import GeoModel, StructuralFrame, SurfacePointsTable, StructuralElement, OrientationsTable
-from gempy.core.data.orientations import DEFAULT_ORI_NUGGET
-from gempy.core.data.surface_points import DEFAULT_SP_NUGGET
+from ...core.data import GeoModel, StructuralFrame, SurfacePointsTable, StructuralElement, OrientationsTable
+from ...core.data.orientations import DEFAULT_ORI_NUGGET
+from ...core.data.surface_points import DEFAULT_SP_NUGGET
 
 
 def add_surface_points(