[ENH] Introduce FiniteFault model with validation, serialization, and spline taper support

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Adds a Pydantic-based FiniteFault dataclass to define finite faults with validated, JSON-serializable fields. Supports cubic, quadratic, and spline tapers, with validation for radii, rotation, and spline control points. Refactors slip calculation logic to use FiniteFault and centralizes controls for consistency. Includes tests for serialization, validation, and taper configurations, along with updated documentation.

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• [ENH] Wire finite-fault definitions into fault stack interpolation #93 : 2 dependent PRs (#94 , #96 )
• [ENH] Refactor project_points_onto_surface for robustness and nonlinear projection support #92
• [ENH] Introduce FiniteFault model with validation, serialization, and spline taper support #91 👈 (View in Graphite)
• [FIX] Ensure tensors consistently move to backend device and add tests for GPU-specific behavior #90
• Added a comprehensive technical implementation report for the Multiscale Anisotropic Field Deformation framework. Describes methodology, GPU-accelerated execution via PyKeOps, and dual-criteria octree subdivision for efficient and precise geological model #95
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Merge activity

• Sep 5, 9:11 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Sep 5, 9:30 AM UTC: Graphite rebased this pull request as part of a merge.
• Sep 5, 9:32 AM UTC: Graphite couldn't merge this PR because it was not satisfying all requirements (Failed CI: 'TestingEngine (Gempy)').