add get_spdlog_logger() internal utility

src/internal/mnode_spdlog.hpp

@@ -0,0 +1,20 @@
+#ifndef A9EC2321_3F3B_49F7_9948_3F7C0983B312
+#define A9EC2321_3F3B_49F7_9948_3F7C0983B312
+
+#include <spdlog/sinks/stdout_color_sinks.h>
+#include <spdlog/spdlog.h>
+
+namespace mesytec::mnode
+{
+
+inline std::shared_ptr<spdlog::logger> get_spdlog_logger(const std::string &name)
+{
+    if (auto logger = spdlog::get(name))
+        return logger;
+
+    return spdlog::stdout_color_mt(name);
+}
+
+} // namespace mesytec::mnode
+
+#endif /* A9EC2321_3F3B_49F7_9948_3F7C0983B312 */