* Add zstd support * Add zstd to CI tests * Use use zstd cmake target instead of ZSTD. Use cmake variable for found packages * Add missing comment for HTTPLIB_REQUIRE_ZSTD * Fix test.yaml rebase error * Use zstd::libzstd target * Add include and library paths to ZSTD args * Run clang-format * Add zstd to httplibConfig.cmake.in