feat: LEAP-58: Proxy URL for Taxonomy if possible

onProxyUrl should be provided to LSF from LS.
TODO: can be not the correct way to call it, check how events invoke.

src/tags/control/Taxonomy/Taxonomy.js

@@ -518,6 +518,7 @@ const Model = types
         if (!self.isLoadedByApi) return Super.updateValue?.(store);
 
         self._api = parseValue(self.apiurl, store.task.dataObj);
+        self._api = store.onProxyUrl?.(self._api) ?? self._api;
 
         yield self.loadItems();
       }),