Add Gateway Modbus component with configuration and bridge implementation

- Created CMakeLists.txt for the Gateway Modbus component.
- Added header file `gateway_modbus.hpp` defining configuration structures, enums, and point structures.
- Implemented the `gateway_modbus.cpp` source file containing the logic for managing Modbus points, including reading and writing operations.
- Introduced utility functions for converting configurations to and from DaliValue, and for handling Modbus space and access types.
- Established a bridge class to manage Modbus points and their interactions with the DaliBridgeEngine.

Co-authored-by: Copilot <copilot@github.com>

components/gateway_bridge/include/gateway_bridge.hpp

@@ -12,6 +12,7 @@
 namespace gateway {
 
 class DaliDomainService;
+class GatewayCache;
 
 struct GatewayBridgeServiceConfig {
   bool bridge_enabled{true};
@@ -35,6 +36,7 @@ struct GatewayBridgeHttpResponse {
 class GatewayBridgeService {
  public:
   GatewayBridgeService(DaliDomainService& dali_domain,
+                       GatewayCache& cache,
                        GatewayBridgeServiceConfig config = {});
   ~GatewayBridgeService();
 
@@ -52,6 +54,7 @@ class GatewayBridgeService {
   const ChannelRuntime* findRuntime(uint8_t gateway_id) const;
 
   DaliDomainService& dali_domain_;
+  GatewayCache& cache_;
   GatewayBridgeServiceConfig config_;
   std::vector<std::unique_ptr<ChannelRuntime>> runtimes_;
 };