Add the query to the `update` command to filter karas to update

Add a query to the update function used to filter the karas to update. Only the karas that matches the query will be updated.

Also refactor the URI thing, now the implementations is hidden from the rest of the code.

Partially solves #102 (closed)

src/module/module_repo.c

@@ -444,6 +444,7 @@ ___handle_got_json_internal_callback(const char *key, const char *val, int comp,
         /* The kara is already present in the DB */
         else {
             LOG_INFO("REPO", "Skip DL of kara %ld because we are in a dry update", kara->id);
+            LOG_UNREACHABLE;
         }
 
         lkt_queue_send(kara->repo->queue, LKT_EVENT_DB_UPDATE_TICK, NULL);