Fix derived function reflection hot reload

[ccummingsNV]

Summary

• retain each function's directly derived overloads and specializations with the type information needed to recreate them
• recursively refresh derived reflection objects when their parent function is refreshed
• match overloads by parameter signature so declaration reordering remains compatible
• extend native reflection hot-reload coverage to direct and nested derived functions

Root cause

Layout hot reload refreshed named functions, but overload and specialization objects are created outside the named-function cache. Those live objects therefore retained invalid low-level reflection after device hot reload, which could terminate Python when Falcor2 reused a specialized path-tracer function.

Keeping the derivation tree on Function lets each refreshed parent repair its existing children. If the corresponding overload, specialization, or argument type no longer exists, the child remains invalid as expected.

Validation

• VS2022 17.10 Release build: slangpy_ext, falcor2_ext, and falcor2_tests
• focused native hot-reload test: 40 assertions passed
• full native SlangPy suite: 196 passed, 1 skipped; 14,884 assertions
• Python reflection hot-reload tests: 6 passed across D3D12, Vulkan, and CUDA
• real watched-file D3D12 invalidation reproduced and verified for overload, specialization, and nested specialization objects
• pre-commit run --all-files

[CLAassistant]

All committers have signed the CLA.

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