Add diagnostic bit support to Gateway Modbus

- Introduced new enum value `kShortDiagnosticBit` to `GatewayModbusGeneratedKind`.
- Enhanced `GatewayModbusPoint` and `GatewayModbusPointBinding` structures to include diagnostic snapshot, boolean key, and device type.
- Added new diagnostic bit specifications and updated the corresponding arrays for generated discrete inputs and holding registers.
- Implemented `addGeneratedDiagnosticPoint` function to handle the creation of diagnostic points.
- Updated `rebuildMap` method to include generated diagnostic points during the map rebuilding process.

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

components/gateway_bacnet/include/gateway_bacnet_stack_port.h

@@ -52,9 +52,20 @@ bool gateway_bacnet_stack_upsert_object(
     gateway_bacnet_object_kind_t object_kind,
     uint32_t object_instance,
     const char* object_name,
-  const char* description,
-  bool out_of_service,
-  uint32_t reliability);
+    const char* description,
+    bool out_of_service,
+    uint32_t reliability);
+
+bool gateway_bacnet_stack_set_object_state(
+    gateway_bacnet_object_kind_t object_kind,
+    uint32_t object_instance,
+    bool out_of_service,
+    uint32_t reliability);
+
+bool gateway_bacnet_stack_set_present_value(
+    gateway_bacnet_object_kind_t object_kind,
+    uint32_t object_instance,
+    const gateway_bacnet_write_value_t* value);
 
 bool gateway_bacnet_stack_clear_objects(void);