enhancement: new "config" module to access configuration in RAM

This is to allow moving some tasks/stack memory to SPIRAM, saving on
precious IRAM. HTTP server should also be more responsive.

components/cmd_nvs/cmd_nvs.c

@@ -91,7 +91,7 @@ static nvs_type_t str_to_type(const char *type)
 
     return NVS_TYPE_ANY;
 }
-static const char *type_to_str(nvs_type_t type)
+const char *type_to_str(nvs_type_t type)
 {
     for (int i = 0; i < TYPE_STR_PAIR_SIZE; i++) {
         const type_str_pair_t *p = &type_str_pair[i];

components/cmd_nvs/cmd_nvs.h

@@ -7,6 +7,7 @@
    CONDITIONS OF ANY KIND, either express or implied.
 */
 #pragma once
+#include "nvs_flash.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -14,7 +15,7 @@ extern "C" {
 
 // Register NVS functions
 void register_nvs();
-
+const char *type_to_str(nvs_type_t type);
 #ifdef __cplusplus
 }
 #endif