[EPIC] Track future breaking changes

[jrhemstad]

This issue is to keep track of breaking changes we'd like to make in the next major version release.

Tasks

• Drop support for CTK 11.x
• [FEA]: Refactor user-facing Thrust types to use libcu++  #34
• Remove multiplication and division nan handling <complex> Enable users to disable normalization for division too. libcudacxx#474 (review)
• Remove CDPv1 Support
• Deprecate thrust::async #100
• [FEA]: Deprecate GridBarrier and GridBarrierLifetime #1389
• Drop support for Intel ICC
• Drop support for VS 2017
• Require C++17 for compiling libcu++ (pending confirmation from relevant users)
• Require C++17 for compiling Thrust and CUB
• Unify accumulator type handling across CUB/Thrust
• Unify initial value handling across CUB/Thrust
• Drop deprecated ::result_type etc. from Thrust function objects (and alias them to the libcu++ ones)
• Drop cub::Mutex
• Drop CUB iterators which exist in Thrust or libcu++
• Drop all deprecated CUB APIs accepting a debug_synchronous paramter
• Drop CUB legacy macros in util_arch.cuh
• Thrust universal_host_pinned_memory_resource's pointer type should probably be a universial_ptr #2659
• [BUG]: thrust::transform_iterator<F, ...> is broken if F is not copy_assignable #2393
• Make thrust::identity::operator() have the same return type as cuda::std::identity::operator()
• [FEA]: ceil_div should return the resulting type of its operation #2845
• Consider dropping cub::DeviceSpmv in favor of cuSPARSE #3070
• Replace our current mdspan implementation with one derived from the newer llvm implementation
• Replace boolean parameters of CUB dispatchers by enumerations (@elstehle)
• Move all CUB dispatchers into internal namespaces #3094
• Swap order of template parameters of DispatchBatchMemcpy and DispatchReduce so policy hub is last
• Assert offset type in DispatchScan to be unsigned
• Review and deprecate macros from thrust/thrust/system/cuda/config.h
• Deprecate and replace cub::min/max by cuda::std::min/max\
• Extended floating-point type replacement
• Deprecate and drop old libcu++ ABI namespaces