[FEATURE] Add mesh extraction module using marching cubes algorithm

[Leguark]

TODO: Needs new version of gempy viewer

Description

Added a new module for mesh extraction using the marching cubes algorithm. The implementation provides a clean way to extract meshes for all structural elements in a geological model.

The new mesh_extraction module contains functions to:

• Extract meshes for all structural elements in a model
• Process individual elements with proper coordinate transformations
• Handle the conversion from scalar fields to 3D meshes

Refactored the test_marching_cubes.py to use the new module, significantly simplifying the test code by removing the manual implementation that was previously used.

Relates to #mesh-extraction-enhancement

Checklist

• My code uses type hinting for function and method arguments and return values.
• I have created tests which cover my code.
• The test code either 1. demonstrates at least one valuable use case (e.g. integration tests)
  or 2. verifies that outputs are as expected for given inputs (e.g. unit tests).
• New tests pass locally with my changes.

[Leguark]

• [WIP] Adding masking to marching cubes #1006
• [FEATURE] Add mesh extraction module using marching cubes algorithm #1005 👈 (View in Graphite)
• [ENH/WIP] Adding first test to implement marching cubes #1000
• main

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[Leguark]

Merge activity

• Mar 23, 4:11 AM EDT: A user started a stack merge that includes this pull request via Graphite.
• Mar 23, 4:13 AM EDT: Graphite rebased this pull request as part of a merge.
• Mar 23, 4:19 AM EDT: A user merged this pull request with Graphite.