[NRF] Implemented PLMN list update handling in nrf_nnrf_handle_nf_update (#3566)

- Added functionality to parse and validate the plmnList JSON array
  during a PATCH request.
- Updated the nf_instance structure with new PLMN data from the request.
- Ensured robust error handling for invalid PLMN entries
  and excessive PLMN counts.
- Responded with appropriate HTTP status codes for success and error scenarios.

lib/sbi/conv.c

@@ -1205,6 +1205,35 @@ void ogs_sbi_free_plmn_list(OpenAPI_list_t *PlmnList)
     OpenAPI_list_free(PlmnList);
 }
 
+/**
+ * Compares an ogs_plmn_id_t structure with an OpenAPI_plmn_id_t structure.
+ *
+ * @param plmn_list The PLMN-ID in ogs_plmn_id_t format.
+ * @param PlmnList The PLMN-ID in OpenAPI_plmn_id_t format.
+ * @return true if the PLMN-IDs are equal; otherwise, false.
+ */
+bool ogs_sbi_compare_plmn_list(
+        ogs_plmn_id_t *plmn_id, OpenAPI_plmn_id_t *PlmnId)
+{
+    ogs_plmn_id_t temp_plmn_id;
+
+    ogs_assert(plmn_id);
+    ogs_assert(PlmnId);
+    ogs_assert(PlmnId->mcc);
+    ogs_assert(PlmnId->mnc);
+
+    /* Convert OpenAPI_plmn_id_t to ogs_plmn_id_t */
+    ogs_sbi_parse_plmn_id(&temp_plmn_id, PlmnId);
+
+    /* Compare MCC and MNC values */
+    if (ogs_plmn_id_mcc(plmn_id) == ogs_plmn_id_mcc(&temp_plmn_id) &&
+        ogs_plmn_id_mnc(plmn_id) == ogs_plmn_id_mnc(&temp_plmn_id)) {
+        return true;
+    }
+
+    return false;
+}
+
 OpenAPI_plmn_id_nid_t *ogs_sbi_build_plmn_id_nid(ogs_plmn_id_t *plmn_id)
 {
     OpenAPI_plmn_id_nid_t *PlmnIdNid = NULL;