Improve error handling of API (#4345)

* wip

* wip

* wip

* Update attached_notes.ts

* wip

* Refactor

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* Update call.ts

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* ✌️

* Fix

src/server/api/endpoints/stats.ts

@@ -14,7 +14,7 @@ export const meta = {
 	}
 };
 
-export default define(meta, () => new Promise(async (res, rej) => {
+export default define(meta, async () => {
 	const instance = await fetchMeta();
 
 	const stats: any = instance.stats;
@@ -26,5 +26,5 @@ export default define(meta, () => new Promise(async (res, rej) => {
 	const federationStats = await federationChart.getChart('hour', 1);
 	stats.instances = federationStats.instance.total[0];
 
-	res(stats);
-}));
+	return stats;
+});