print task name if logger is called from other than main thread (#6630)

esphome/components/logger/logger.h

@@ -167,6 +167,7 @@ class Logger : public Component {
   CallbackManager<void(int, const char *, const char *)> log_callback_{};
   /// Prevents recursive log calls, if true a log message is already being processed.
   bool recursion_guard_ = false;
+  void *main_task_ = nullptr;
 };
 
 extern Logger *global_logger;  // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)