Add serial log levels

firmware/esp32/xterra-controller/logger.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <Arduino.h>
+
+enum LogLevel {
+    LOG_QUIET = 0,
+    LOG_INFO = 1,
+    LOG_DEBUG = 2
+};
+
+extern LogLevel currentLogLevel;
+
+void setLogLevel(LogLevel level);
+void logInfo(const String& message);
+void logDebug(const String& message);