Add json import/export to SimulationData

[taylorbrown75]

Added ability to import/export simulation data to json.
Added unit tests, and end to end testing of json functionality.

[Copilot]

Pull Request Overview

This PR adds JSON import/export functionality to SimulationData, enabling serialization and deserialization of simulation configurations. The implementation includes comprehensive unit tests covering round-trip conversion, precision handling, edge cases, and error scenarios.

Key Changes:

• Added JSON serialization/deserialization support for all simulation data structures (elements, surfaces, apertures, optical properties, ray sources)
• Implemented import_json_file() and export_json_file() methods on SimulationData
• Created extensive test suite with 8 test cases covering various scenarios including round-trip conversion, large field comparison, precision validation, empty cases, and error handling

Reviewed Changes

Copilot reviewed 26 out of 26 changed files in this pull request and generated 33 comments.

Show a summary per file

File	Description
google-tests/unit-tests/simulation_runner/native_runner/calculator_factory_test.cpp	Added write_json override to UnknownSurface test fixture
google-tests/unit-tests/simulation_data/file_io_test.cpp	New test file with comprehensive JSON I/O tests including round-trip, precision, validation, and error handling
google-tests/unit-tests/simulation_data/aperture_test.cpp	Added write_json implementation to TestAperture fixture
google-tests/unit-tests/simulation_data/CMakeLists.txt	Updated build configuration to include new test file and required dependencies
coretrace/simulation_data/surface.hpp	Added write_json virtual method and JSON constructors to all surface types; added SurfaceTypeMap
coretrace/simulation_data/surface.cpp	Implemented JSON serialization/deserialization for Cone, Cylinder, Flat, Parabola, and Sphere surfaces
coretrace/simulation_data/stage_element.hpp	Added JSON constructor and write_json method declarations
coretrace/simulation_data/stage_element.cpp	Implemented JSON import/export for stage elements with validation
coretrace/simulation_data/single_element.hpp	Added JSON constructor and write_json method declarations
coretrace/simulation_data/single_element.cpp	Implemented JSON serialization for single elements including aperture, surface, and optical properties
coretrace/simulation_data/simulation_data.hpp	Added public API methods for JSON import/export and ray source iteration
coretrace/simulation_data/simulation_data.cpp	Delegated JSON I/O methods to simdata_io functions
coretrace/simulation_data/simdata_io.hpp	Added write_json_file, load_json_file functions and get_enum_from_string template utility
coretrace/simulation_data/simdata_io.cpp	Core JSON serialization logic for entire simulation including parameters, sources, and elements
coretrace/simulation_data/ray_source.hpp	Added UNKNOWN enum value and SunShapeMap for string conversion
coretrace/simulation_data/optical_properties.hpp	Added JSON constructor and write_json method; added InteractionTypeMap
coretrace/simulation_data/optical_properties.cpp	Implemented JSON serialization for optical properties
coretrace/simulation_data/json_helpers.hpp	New utility header for JSON value extraction with NaN handling
coretrace/simulation_data/error_distributions.hpp	Added UNKNOWN enum value and DistributionTypeMap
coretrace/simulation_data/element.hpp	Added pure virtual write_json methods and is_top_level check to Element interface
coretrace/simulation_data/element.cpp	Implemented JSON constructor and common JSON serialization for ElementBase
coretrace/simulation_data/composite_element.hpp	Added JSON constructor and write_json method declarations
coretrace/simulation_data/composite_element.cpp	Implemented recursive JSON serialization for composite elements
coretrace/simulation_data/aperture.hpp	Added write_json virtual method and JSON constructors for all aperture types; added ApertureTypeMap
coretrace/simulation_data/aperture.cpp	Implemented JSON serialization/deserialization for all aperture types
coretrace/simulation_data/CMakeLists.txt	Added nlohmann_json library dependency via FetchContent

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[jmaack24]

Good work! Looks really good to me. I left a few notes on things.