[CLN] Remove unused experimental watertight dual contouring code

[Leguark]

[CLN] Remove unused experimental watertight dual contouring code

• Deleted _experimental_water_tight_DC_1.py and _interpolate_on_edges.py as unused and redundant.
• Removed references to deprecated watertightness-related debug options.
• Cleaned up legacy logic in multi_scalar_dual_contouring.py.
• Simplified comments and unused code in interpolation features.

[ENH] Add scalar field verification for graben and simplest models

• Introduced scalar field sampling and verification for "graben_fault_model" and "simplest_model" tests.
• Integrated approval tests with gempy_verify_array using GenericDiffReporter.
• Updated test_public_interface and added _verify_scalar_field for scalar field validation.
• Improved readability and debugging options for scalar field outputs.

[CLN] Remove unused import for experimental watertight dual contouring

[CLN] Remove unused function interpolate_single_field and clean up related logic

• Deleted interpolate_single_field as it was redundant and only used in testing.
• Replaced its test references with a local _interpolate_single_field helper function.
• Refactored and streamlined the interpolate_scalar_field logic, moving parts to a new foo function for better clarity.
• Improved code organization by restructuring imports and removing unused dependencies.

[WIP] Towards transposing stack loops

[WIP] SPlitting interpolate feature function

[WIP] Adding input classes for the efficient way of compute stacks

[WIP] Working out the loops

[WIP] Running tests

[WIP] Adding logic for solving faults

[CLN] Move functions to each own module

[CLN] Remove unused local function _grab_stack_fault_data and clean up related logic

• Deleted _grab_stack_fault_data as it was redundant and unused.
• Adjusted imports to reflect related changes.
• Simplified _interpolate_stack by removing unnecessary code.

[CLN] Refactor stack structure logic and simplify interpolation input management

• Updated stack structure handling to directly use stack_structure.stack_number instead of passing stack_number.
• Removed redundant conditional in _multi_scalar_field_manager.
• Streamlined interpolation input creation by eliminating unnecessary function arguments.

[WIP] Debugging interpolation flat

[WIP] Debugging interpolation flat II

[WIP] Fault test runs but with different result

[WIP] Debugging

[WIP] Trying to deal with stacks dependencies

[WIP] Chuncking

[WIP] Tests running

[WIP] cleaning

[ENH] interpolate_stack_flat running

[CLN] Refactor _stack_ops and _multi_scalar_field_manager for clarity and consistency

• Renamed _InterpolationState to InterpolationState and _process_chunk to process_chunk.
• Replaced multiple internal functions (e.g., compute_weights_for_stacks, evaluate, segment) with prefixed counterparts (_compute_weights_for_stacks, _evaluate, _segment) for better encapsulation.
• Simplified fault values update logic within _process_chunk.
• Removed redundant imports and improved type annotations for consistency across modules.

[ENH] Add external interpolation function support and improve segmentation logic

• Introduced _scalar_field_segmentation_v2 for segmentation using an activator interface.
• Added interpolate_feature_with_external_function to handle external interpolation logic.
• Refactored segmentation into a dedicated _segment function for clarity and reuse.
• Updated _stack_ops and _multi_scalar_field_manager to support stack-specific interpolation functions and external segmentation.

[Leguark]

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• [ENH] Parallelize solver input preparation using ThreadPoolExecutor #55
• [WIP] Towards split evaluation options #54
• [WIP] Prepare for pykeops ranges #53
• [CLN] Remove unused experimental watertight dual contouring code #52 👈 (View in Graphite)
• [OPT] V1 half the time #51
• [REFACTOR] Reorganize dual contouring vertex overlap logic into separate modules #49 : 1 other dependent PR (#50 )
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