Extends UART change at runtime to ESP8266 (#6019)

esphome/components/uart/uart_component_esp8266.h

@@ -63,6 +63,21 @@ class ESP8266UartComponent : public UARTComponent, public Component {
 
   uint32_t get_config();
 
+  /**
+   * Load the UART with the current settings.
+   * @param dump_config (Optional, default `true`): True for displaying new settings or
+   * false to change it quitely
+   *
+   * Example:
+   * ```cpp
+   * id(uart1).load_settings();
+   * ```
+   *
+   * This will load the current UART interface with the latest settings (baud_rate, parity, etc).
+   */
+  void load_settings(bool dump_config) override;
+  void load_settings() override { this->load_settings(true); }
+
  protected:
   void check_logger_conflict() override;