Fixes issue #585 -> Resolve contains() method returning false for existing string values

.cargo/config.toml

@@ -1,6 +1,6 @@
 [build]
 target = "riscv32imc-esp-espidf"
-#target = "xtensa-esp32-espidf"
+# target = "xtensa-esp32-espidf"
 
 [target.xtensa-esp32-espidf]
 linker = "ldproxy"

examples/nvs_get_set_raw_storage.rs

@@ -30,7 +30,7 @@ fn main() -> anyhow::Result<()> {
     let nvs_default_partition: EspNvsPartition<NvsDefault> = EspDefaultNvsPartition::take()?;
 
     let test_namespace = "test_ns";
-    let nvs = match EspNvs::new(nvs_default_partition, test_namespace, true) {
+    let nvs = match EspKeyValueStorage::new(nvs_default_partition, test_namespace, true) {
         Ok(nvs) => {
             info!("Got namespace {test_namespace:?} from default partition");
             nvs