[ENH] Implement surface-based dual contouring with optimized triangulation

[Leguark]

[ENH] Dual contouring v2

This PR introduces a new version of the dual contouring algorithm with significant improvements:

• Added a new implementation _dual_contouring_v2.py that processes surfaces individually
• Refactored the data flow to handle surfaces more efficiently
• Renamed all_stack_intersection to all_surfaces_intersection for clarity
• Added surface slicing functionality to process individual surfaces
• Removed unused left_right parameter from DualContouringMesh class
• Optimized triangulation logic in fancy_triangulation.py with more efficient algorithms
• Enhanced voxel mapping with improved search methods using isin and optimized mask-to-indices conversion
• Added trimesh-based mesh cleanup as a final processing step
• Improved parallel processing capabilities with better worker management
• Added legacy mode toggle to maintain backward compatibility

The new implementation provides better performance by processing each surface independently and using more efficient data structures and algorithms.

[Leguark]

• [REFACTOR] Optimize dual contouring vertex generation and add vertex overlap configuration #36
• [ENH] Implement surface-based dual contouring with optimized triangulation #35 👈 (View in Graphite)
• [REFACTOR] Modularize triangulation code with helper functions for improved readability | GEN-13490 #34
• [REFACTOR] Optimize dual contouring gradient handling and normal correction | GEN-13490 #33
• [FIX] Correct vertex index calculation in meshes_to_subsurface method | GEN-13490 #32
• main

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[Leguark]

Merge activity

• Oct 9, 10:07 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Oct 9, 10:24 AM UTC: Graphite rebased this pull request as part of a merge.
• Oct 9, 10:26 AM UTC: @Leguark merged this pull request with Graphite.