support random sampling of tuple types: add tests #51630
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EDIT: this was also implemented in #50251, which is now merged, so merge this now for the added tests, and the added feature of `rand(Tuple{})`. This allows e.g `rand(NTuple{5,Int})` to sample a tuple of 5 `Int`s. The implementation simply assembles a tuple by calling `rand` on the corresponding type parameters of the tuple type. A generated function is used to ensure type stability.
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domain:randomness
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This is a rebase of #35856, where we keep only the tests, as the functionality was added in #50251. This also adds the possibility to call
randon an empty tuple type:rand(Tuple{}).