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

* refactor(helpers): separate functions into files

* idk

* idk

src/helpers/guilds/get_ban.ts

@@ -0,0 +1,15 @@
+import { RequestManager } from "../../rest/request_manager.ts";
+import { BannedUser } from "../../types/mod.ts";
+import { endpoints } from "../../util/constants.ts";
+import { requireBotGuildPermissions } from "../../util/permissions.ts";
+
+/** Returns a ban object for the given user or a 404 not found if the ban cannot be found. Requires the BAN_MEMBERS permission. */
+export async function getBan(guildID: string, memberID: string) {
+  await requireBotGuildPermissions(guildID, ["BAN_MEMBERS"]);
+
+  const result = await RequestManager.get(
+    endpoints.GUILD_BAN(guildID, memberID),
+  );
+
+  return result as BannedUser;
+}