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

* refactor(helpers): separate functions into files

* idk

* idk

src/helpers/guilds/get_bans.ts

@@ -0,0 +1,18 @@
+import { RequestManager } from "../../rest/request_manager.ts";
+import { BannedUser } from "../../types/mod.ts";
+import { Collection } from "../../util/collection.ts";
+import { endpoints } from "../../util/constants.ts";
+import { requireBotGuildPermissions } from "../../util/permissions.ts";
+
+/** Returns a list of ban objects for the users banned from this guild. Requires the BAN_MEMBERS permission. */
+export async function getBans(guildID: string) {
+  await requireBotGuildPermissions(guildID, ["BAN_MEMBERS"]);
+
+  const results = (await RequestManager.get(
+    endpoints.GUILD_BANS(guildID),
+  )) as BannedUser[];
+
+  return new Collection<string, BannedUser>(
+    results.map((res) => [res.user.id, res]),
+  );
+}