[REFACTOR] Modernize triangulation code and remove legacy mesh extraction method

[Leguark]

Enhanced Dual Contouring Triangulation

This PR improves the dual contouring triangulation system to support arbitrary grid shapes beyond the previous 2x2x2 limitation:

• Removed the legacy triangulation method and deprecated the mesh_extraction_fancy option
• Enhanced the triangulation algorithm to work with anisotropic octrees (non-cubic root grids)
• Simplified the triangulation code interface by removing unnecessary parameters
• Added support for arbitrary grid dimensions by dynamically calculating bit packing factors
• Added a test case for anisotropic octree dual contouring

The implementation now properly handles root grid resolutions other than 2³, making the dual contouring system more flexible for different model configurations.

[Leguark]

• [ENH] Implement batched GPU interpolation with CUDA streams for parallel stack processing | GEN-14003 #42
• [REFACTOR] Modernize triangulation code and remove legacy mesh extraction method #43 👈 (View in Graphite)
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