refactor(helpers): separate functions into files (#667)

* refactor(helpers): separate functions into files

* idk

* idk

src/helpers/invites/get_invites.ts

@@ -0,0 +1,12 @@
+import { RequestManager } from "../../rest/request_manager.ts";
+import { endpoints } from "../../util/constants.ts";
+import { requireBotGuildPermissions } from "../../util/permissions.ts";
+
+/** Get all the invites for this guild. Requires MANAGE_GUILD permission */
+export async function getInvites(guildID: string) {
+  await requireBotGuildPermissions(guildID, ["MANAGE_GUILD"]);
+
+  const result = await RequestManager.get(endpoints.GUILD_INVITES(guildID));
+
+  return result;
+}