Add prelude function for URL Query (#4135)

* Update string.ts

* Refactor

* Update string.ts

* Update wrap-url.ts

* Update string.ts

* Update get-static-image-url.ts

* Use querystring.stringify

* Update outbox.ts

* Back to the urlQuery

* Update followers.ts

* Update following.ts

* Update outbox.ts

* Update string.ts

* Update get-static-image-url.ts

* Update string.ts

* Update string.ts

* Separate prelude files

src/prelude/url.ts

@@ -0,0 +1,7 @@
+import { stringify } from 'querystring';
+
+export function query(obj: {}): string {
+	return stringify(Object.entries(obj)
+		.filter(([, v]) => Array.isArray(v) ? v.length : v !== undefined)
+		.reduce((a, [k, v]) => (a[k] = v, a), {} as Record<string, any>));
+}