Refactor GatewayController to integrate GatewayCache

- Updated CMakeLists.txt to require gateway_cache component.
- Modified gateway_controller.hpp to include GatewayCache and adjust constructor.
- Removed internal scene and group management logic from GatewayController, delegating to GatewayCache.
- Simplified scene and group operations by utilizing GatewayCache methods for enabling, setting details, and deleting.
- Eliminated NVS storage handling code, as scene and group data is now managed by GatewayCache.
- Updated command handling methods to use cached data instead of internal structures.

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

components/gateway_cache/CMakeLists.txt

@@ -0,0 +1,7 @@
+idf_component_register(
+    SRCS "src/gateway_cache.cpp"
+    INCLUDE_DIRS "include"
+    REQUIRES freertos log nvs_flash
+)
+
+set_property(TARGET ${COMPONENT_LIB} PROPERTY CXX_STANDARD 17)