新增http、mqtt运行库，实现mqtt功能, 新增spdlog

thirdparty/spdlog-1.13.0/tests/utils.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <cstddef>
+#include <string>
+
+std::size_t count_files(const std::string &folder);
+
+void prepare_logdir();
+
+std::string file_contents(const std::string &filename);
+
+std::size_t count_lines(const std::string &filename);
+
+void require_message_count(const std::string &filename, const std::size_t messages);
+
+std::size_t get_filesize(const std::string &filename);
+
+bool ends_with(std::string const &value, std::string const &ending);