[FEA]: Automate documentation for libcu++ Standard Library header support

[jrhemstad]

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Area

libcu++

Is your feature request related to a problem? Please describe.

As a user of libcu++, I want to know what Standard Library headers and features are supported.

However, keeping a list manually updated of what headers/features we support is a recipe for stale documentation.

Describe the solution you'd like

I'd like an automated solution that can parse the headers in libcu++ and generate a table of what Standard Library headers we support (alongside any limitations or caveats).

One thing to consider is we could also parse our feature test macro definitions and build a table of which features we support based on that.

See:

• https://en.cppreference.com/w/cpp/utility/feature_test
• https://github.com/NVIDIA/cccl/blob/main/libcudacxx/include/cuda/std/detail/libcxx/include/version

Describe alternatives you've considered

No response

Additional context

No response