Implement DALI Bridge Engine and Model Management

- Added `bridge.cpp` to handle DALI bridge operations including model management, command execution, and response formatting.
- Introduced `bridge_model.cpp` for defining bridge models, value transformations, and JSON serialization/deserialization.
- Created `bridge_provisioning.cpp` for managing bridge configuration storage and retrieval using NVS on ESP platform.
- Enhanced `gateway_cloud.cpp` to integrate DALI bridge requests and responses with cloud communication.
- Introduced `modbus_bridge.cpp` to handle Modbus-specific operations and register management.
- Implemented utility functions for converting between DaliValue and cJSON formats.
- Added error handling and metadata management in bridge responses.

include/gateway_cloud.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "bridge.hpp"
 #include "dali_comm.hpp"
 
 #include <atomic>
@@ -27,6 +28,8 @@ class DaliCloudBridge {
   bool start(const GatewayCloudConfig& config);
   void stop();
   bool isConnected() const;
+  DaliBridgeEngine& bridge() { return bridge_; }
+  const DaliBridgeEngine& bridge() const { return bridge_; }
 
   bool publishStatus(const std::string& status);
   bool publishRegister(const std::string& payloadJson);
@@ -49,6 +52,7 @@ class DaliCloudBridge {
   std::string topicRegister() const;
 
   DaliComm& comm_;
+  DaliBridgeEngine bridge_;
   GatewayCloudConfig config_;
   std::atomic<bool> connected_{false};