[FIX] relax seqan3::views::to_simd requirements to be C++20 compatible

[marehr]

Part of seqan/product_backlog#403

/seqan3/test/unit/utility/simd/views/to_simd_test.cpp:349:48:   required from ‘void view_to_simd_test_issue_1813_Test<gtest_TypeParam_>::TestBody() [with gtest_TypeParam_ = std::tuple<std::deque<seqan3::dna4, std::allocator<seqan3::dna4> >, __vector(1) signed char>]’
/seqan3/test/unit/utility/simd/views/to_simd_test.cpp:326:1:   required from here
/seqan3/include/seqan3/utility/simd/views/to_simd.hpp:67:24: error: static assertion failed: Expects the inner range to be default constructible.
   67 |     static_assert(std::default_initializable<std::ranges::range_value_t<urng_t>>,
      |                   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/seqan3/include/seqan3/utility/simd/views/to_simd.hpp:67:24: note: ‘default_initializable<std::ranges::take_view<std::ranges::ref_view<std::deque<seqan3::dna4, std::allocator<seqan3::dna4> > > > >’ evaluates to false
/seqan3/include/seqan3/utility/simd/views/to_simd.hpp:67:24: note: constraints not satisfied
In file included from /opt/gcc/gcc-git/include/c++/12.0.0/compare:39,
                 from /opt/gcc/gcc-git/include/c++/12.0.0/bits/stl_pair.h:65,
                 from /opt/gcc/gcc-git/include/c++/12.0.0/bits/stl_algobase.h:64,
                 from /opt/gcc/gcc-git/include/c++/12.0.0/memory:63,
                 from /seqan3-build/gcc-git-debug-std20/_deps/gtest_fetch_content-src/googletest/include/gtest/gtest.h:57,
                 from /seqan3/test/unit/utility/simd/views/to_simd_test.cpp:8:
/opt/gcc/gcc-git/include/c++/12.0.0/concepts:138:13:   required for the satisfaction of ‘constructible_from<_Tp>’ [with _Tp = std::ranges::take_view<std::ranges::ref_view<std::deque<seqan3::dna4, std::allocator<seqan3::dna4> > > >]
/opt/gcc/gcc-git/include/c++/12.0.0/concepts:139:30: note: the expression ‘is_constructible_v<_Tp, _Args ...> [with _Tp = std::ranges::take_view<std::ranges::ref_view<std::deque<seqan3::dna4, std::allocator<seqan3::dna4> > > >; _Args = {}]’ evaluated to ‘false’
  139 |       = destructible<_Tp> && is_constructible_v<_Tp, _Args...>;
      |                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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[codecov]

Codecov Report

Merging #2849 (9accf83) into master (dcbba96) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2849   +/-   ##
=======================================
  Coverage   98.37%   98.37%           
=======================================
  Files         277      277           
  Lines       10963    10963           
=======================================
  Hits        10785    10785           
  Misses        178      178           

Impacted Files	Coverage Δ
include/seqan3/utility/simd/views/to_simd.hpp	91.52% <ø> (ø)

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[marehr]

@remyschwab If you need help to understand this, we can meet up :)