Ensure CTAD works for all thrust iterators

[bernhardmgruber]

Constructor Template Argument Deduction (CTAD) allows the compiler to infer a class' template arguments from the invocation of its constructor. This feature was introduced in C++17. The workaround before where make_class functions.

Some thrust iterators already support CTAD. E.g. thrust::counting_iterator it{0} correctly deduces counting_iterator<int>. We should check and add tests that CTAD works for all iterators:

• constant_iterator.h
• counting_iterator.h
• discard_iterator.h
• offset_iterator.h
• permutation_iterator.h
• reverse_iterator.h
• tabulate_output_iterator.h
• transform_input_output_iterator.h
• transform_iterator.h
• transform_output_iterator.h
• zip_iterator.h