Fix Clang compilation issues

Dan Notesteinrequested to merge
dan-rebase-bw_optimize-compilation into main

Summary

  • Use promise factory method instead of direct constructor in asio.hpp
  • Make rate_limiting_group_impl destructor virtual in rate_limiting.cpp

Fixes Clang errors to enable ClangBuildAnalyzer usage for build profiling.

Rebased version of bw_optimize-compilation branch.

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