Implement std::normal_distribution

[RAMitchell]

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[bernhardmgruber]

Side note: We also have some implementations of <random> in Thrust under thrust/thrust/random. I would love if we could replace those by new facilities in libcu++! You could try to replace the Thrust implementation by your new one for testing.

[RAMitchell]

https://github.com/NVIDIA/cccl/issues/6595 is preventing us from making this constexpr. We can defer implementing constexpr or I will use another algorithm to generate the normal distribution.

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[fbusato]

/ok to test 7c3c7bb

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