Handle unnamed parameters in generated CUDA shims

[cnaples79]

Summary

• generate stable fallback identifiers for unnamed function parameters when building CUDA shims
• reuse the sanitized names across dynamic/static bindings so call sites emit valid C++
• cover the regression with unit tests that exercise shim generation

Rationale

• fixes Error when using functions with unnamed arguments #168 where unnamed C++ parameters were emitted as in shims, leading NVRTC to fail

Changes

• add a shared sanitizer for C++ parameter names and apply it across function/struct binding code
• ensure shim generators dereference the sanitized identifiers instead of the raw (possibly empty) names
• new tests validating that unnamed and duplicate parameters render distinct argument names

Fixes #168

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