Add serial configuration support to Gateway Modbus

- Introduced GatewayModbusSerialConfig structure to encapsulate serial communication settings.
- Added clamping functions for integer and size values to ensure valid configuration ranges.
- Updated GatewayModbusConfigFromValue to parse serial configuration from JSON input.
- Implemented transport type checking functions for TCP, RTU, ASCII, and Serial.
- Enhanced GatewayModbusConfigToValue to include serial configuration in output.

Signed-off-by: Tony <tonylu@tony-cloud.com>

components/gateway_bridge/include/gateway_bridge.hpp

@@ -2,12 +2,14 @@
 
 #include <cstdint>
 #include <memory>
+#include <optional>
 #include <string>
 #include <vector>
 
 #include "esp_err.h"
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
+#include "gateway_modbus.hpp"
 
 namespace gateway {
 
@@ -24,6 +26,9 @@ struct GatewayBridgeServiceConfig {
   bool cloud_startup_enabled{false};
   uint32_t modbus_task_stack_size{6144};
   UBaseType_t modbus_task_priority{4};
+  std::optional<GatewayModbusConfig> default_modbus_config;
+  bool allow_modbus_uart0{false};
+  std::vector<int> reserved_uart_ports;
   uint32_t bacnet_task_stack_size{8192};
   UBaseType_t bacnet_task_priority{5};
 };