[Stacked PR] Introduce `@tvm_ffi.dataclasses.py_class`#499

Draft

junrushao wants to merge 12 commits intoapache:mainfrom

junrushao:2026-03-09/py-class-support

Commits on Mar 10, 2026

feat(c_api): extend TVMFFIFieldInfo setter to support FunctionObj dispatch

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fix(c++): qualify details:: to ::tvm::ffi::details:: in reflection headers

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feat(ffi): centralize object creation with CreateEmptyObject/HasCreator

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feat(ffi): add __ffi_convert__ type attribute for typed AnyView conversion

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feat(ffi): add Python-defined type support in C++ (dataclass.cc)

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feat(cython): expose additional C API symbols in base.pxi

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feat(cython): add CAny owned-value wrapper and enhance TypeSchema

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feat(cython): add type_converter.pxi with function-pointer dispatch

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test(python): add comprehensive tests for TypeSchema type conversion

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feat(python): add field registration, _register_py_class, Field descriptor

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feat(python): add py_class decorator for Python-defined FFI dataclasses

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test(python): add comprehensive tests for py_class decorator

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