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

* refactor(helpers): separate functions into files

* idk

* idk

src/helpers/roles/get_roles.ts

@@ -0,0 +1,15 @@
+import { RequestManager } from "../../rest/request_manager.ts";
+import { endpoints } from "../../util/constants.ts";
+import { requireBotGuildPermissions } from "../../util/permissions.ts";
+
+/** Returns a list of role objects for the guild.
+ *
+ * ⚠️ **If you need this, you are probably doing something wrong. This is not intended for use. Your roles will be cached in your guild.**
+ */
+export async function getRoles(guildID: string) {
+  await requireBotGuildPermissions(guildID, ["MANAGE_ROLES"]);
+
+  const result = await RequestManager.get(endpoints.GUILD_ROLES(guildID));
+
+  return result;
+}