feat: Add Parametric Hatch Generator macro

[chopinregis]

This pull request adds the Hatch Generator, a new parametric tool for creating complex 2D hatch patterns on Part faces.

Author: @chopinregis Source Repository: https://github.com/chopinregis/FreeCAD-Parametric-Hatch-Generator

Features:

• Creates a fully parametric Part::FeaturePython object for hatches.
• Includes a library of over 100 built-in patterns.
• Supports custom objects for patterns, multiple base objects, and subtractions.
• Provides extensive randomization and variation controls.
• Includes a comprehensive GUI for easy creation and previewing.

Dependencies:

• An optional dependency on scipy is required to use the "Voronoi" and "VoronoiMesh" patterns. The macro functions without it but will print a warning if a user selects those patterns.

This macro is structured as a multi-file addon with a package.xml for integration with the Addon Manager.