LK_LOG_* using spdlog, supporting users specifying their own logging …#68

stephen-derosa wants to merge 3 commits intolivekit:mainlivekit/client-sdk-cpp:mainfrom

stephen-derosa:sderosa/CLT-2587-spdlogstephen-derosa/sderosa-client-sdk-cpp:sderosa/CLT-2587-spdlogCopy head branch name to clipboard