Enable borrowed range for iota_simd view

[rrahn]

Currently, the iota_simd view is not a borrowed range because it depends on the ranges library to support the borrowed range concept which was adopted later for the C++20 standard.

Add this to the end of include/seqan3/core/simd/view_iota_simd.hpp

//!\cond
// Enable borrowed range.
namespace std::ranges
{
template <typename index_t>
inline constexpr bool enable_borrowed_range<seqan3::detail::iota_simd_view<index_t>> = true;
} // namespace std::ranges
//!\endcond

And add this to the test in: test/unit/core/simd/view_iota_simd_test.cpp
to the concept checks test

EXPECT_TRUE(std::ranges::borrowed_range<iota_simd_view_t>);