Added support for JSON schemata for the Reflector type; fixes #509

[liuzicheng1987]

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[gemini-code-assist]

Summary of Changes

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This pull request significantly enhances the JSON schema generation capabilities by introducing full support for types that leverage the Reflector mechanism. By modifying the parser's type recognition and schema generation process, it ensures that custom reflection types defined through Reflector specializations are accurately translated into their corresponding JSON schemata. This change broadens the utility of the schema generation feature, enabling more complex and customized data structures to be precisely represented in JSON schema, and directly addresses issue #509.

Highlights

• Reflector Type Schema Generation: The system now correctly generates JSON schemata for types that utilize the Reflector mechanism, allowing for more flexible and custom schema definitions based on ReflType specializations.
• Expanded Parser Conditions: The internal parser logic has been updated to recognize types with read_reflector or write_reflector specializations, ensuring they are properly handled during schema generation.
• New Test Case for Reflector Schema: A dedicated test file (test_reflector_schema.cpp) has been added to validate the JSON schema generation for Reflector types, confirming the correct output for a Parent struct with a custom Reflector specialization.

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Code Review

This pull request adds support for generating JSON schemas for types that use rfl::Reflector. The changes in Parser_default.hpp correctly extend schema generation to these types, and a new test file is added to verify this functionality. I have one suggestion to improve the robustness of the implementation in Parser_default.hpp to prevent potential compilation errors for certain Reflector specializations.