Migrate from tbb to onetbb

[lkeegan]

• add FlexbarAtomic
  • a simple wrapper around std::atomic which adds a copy constructor
  • to replace tbb::atomic member variables in classes with default copy constructors
• replace removed tbb::atomic
  • with FlexbarAtomic if copy constructor was assumed
  • with std::atomic otherwise
• filters (PairedAlign, PairedInput, PairedOutput)
  • no longer inherit from tbb::filter
  • take and return pointers to actual type instead of void*
  • operator() is now const
• pipeline
  • use parallel_pipeline and make_filter
• use global_control to set max threads
• use oneapi::tbb namespace
• add find_package for TBB to CMakeLists.txt