Add core construtor from json/yaml string

[mattldawson]

Add a constructor of the TUV-x that takes a JSON or YAML string that contains all the configuration data.

[Copilot]

Pull Request Overview

This PR adds a new constructor for the TUV-x core that accepts a JSON/YAML string, refactoring the existing constructor structure to support both file path and configuration object inputs.

• Refactored the core constructor interface to support both file-based and string-based configuration
• Modified function signatures to change intent(inout) to intent(in) for read-only configuration operations
• Removed direct file reading from the main constructor logic to improve separation of concerns

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/core.F90	Refactored constructor interface to add constructor_config for config objects and renamed existing to constructor_file_path
src/util/config.F90	Changed multiple function parameters from intent(inout) to intent(in) for read-only configuration operations

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