Add NVS support for relay channel config persistence

- Introduced NVS configuration options in Kconfig.
- Implemented NVS initialization and deinitialization in relay_chn_core.
- Added functions for storing and retrieving relay channel direction and tilt sensitivity in NVS.
- Updated relay_chn_tilt and relay_chn_output to utilize NVS for state management.
- Created relay_chn_nvs.c and relay_chn_nvs.h for NVS-related functionalities.

Closes #1074.

src/relay_chn_core.c

@@ -11,9 +11,15 @@
 #include "relay_chn_output.h"
 #include "relay_chn_run_info.h"
 #include "relay_chn_ctl.h"
+
 #if RELAY_CHN_ENABLE_TILTING == 1
 #include "relay_chn_tilt.h"
 #endif
+
+#if RELAY_CHN_ENABLE_NVS == 1
+#include "relay_chn_nvs.h"
+#endif
+
 #include "relay_chn_core.h"
 
 
@@ -89,6 +95,11 @@ esp_err_t relay_chn_create(const uint8_t* gpio_map, uint8_t gpio_count)
     ESP_RETURN_ON_FALSE(gpio_map != NULL, ESP_ERR_INVALID_ARG, TAG, "gpio_map cannot be NULL");
 
     esp_err_t ret;
+#if RELAY_CHN_ENABLE_NVS == 1
+    ret = relay_chn_nvs_init();
+    ESP_RETURN_ON_ERROR(ret, TAG, "Failed to initialize NVS for relay channel");
+#endif
+
     // Initialize the output
     ret = relay_chn_output_init(gpio_map, gpio_count);
     ESP_RETURN_ON_ERROR(ret, TAG, "Failed to initialize relay channel outputs");
@@ -137,6 +148,10 @@ void relay_chn_destroy(void)
     relay_chn_ctl_deinit();
     relay_chn_output_deinit();
 
+#if RELAY_CHN_ENABLE_NVS == 1
+    relay_chn_nvs_deinit();
+#endif
+
     // Destroy the event loop
     esp_event_loop_delete(relay_chn_event_loop);
     relay_chn_event_loop = NULL;