Add ToDtype tensor operation #582
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Adds to_dtype method for tensors, and will add a TensorVisitor implementation to convert models between dtypes. "to_dtype" is implemented for most conversions between Units, using AsPrimitive on Cpu and macros on Cuda. Due to the large amount of generated code, compiling test_to_dtype adds around 3 seconds to compile times for both cuda and cpu on my machine.
Currently, to_dtype can not be used with OwnedTapes because Gradients can only hold data with a single dtype.
Closes #475.
Tasks: