[REFACTOR] Use center grid for dual contouring instead of corners grid

[Leguark]

Combining centers and corners

This PR refactors the dual contouring implementation to use a more efficient approach for handling grid corners:

• Adds corners_grid property to EngineGrid to store corner values alongside centers
• Modifies interpolate_on_octree to compute corners as part of the center grid rather than separately
• Adds corner-related properties to InterpOutput for accessing corner data
• Fixes __len__ in RegularGrid to return the correct number of active cells
• Replaces _get_intersection_on_edges with direct calls to find_intersection_on_edge for improved consistency
• Updates masking logic to work with the new grid structure
• Simplifies octree generation by removing redundant corner-related code

These changes improve the efficiency of the dual contouring algorithm by reducing redundant computations and simplifying the data flow.

[Leguark]

• [FIX] Reuse weights calculation instead of raising error on hash mismatch #27
• [ENH] Refactor dual contouring with parallel and sequential triangulation modules #26
• [ENH] Refactor dual contouring code with improved documentation and modular functions #25
• [REFACTOR] Use center grid for dual contouring instead of corners grid #24 👈 (View in Graphite)
• [FIX] Use timestamp for cache key instead of input parameters #23
• [FIX] Fix PyKeops tensor operations and ensure contiguous arrays #22
• [ENH] Add PyTorch backend support for dual contouring and octree operations #21
• [!!BUG] Chunking with faults were creating rogue voxels | GEN-13299 #20
• [ENH] Add transform support to meshes_to_subsurface method #19
• [FIX] Separate pykeops_enabled flag from use_pykeops for better control #18
• [ENH] Improve CG solver and add weights caching for better performance #17
• main

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[Leguark]

Merge activity

• Sep 25, 8:42 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Sep 25, 8:43 AM UTC: @Leguark merged this pull request with Graphite.