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

* refactor(helpers): separate functions into files

* idk

* idk

src/helpers/messages/get_reactions.ts

@@ -0,0 +1,19 @@
+import { RequestManager } from "../../rest/request_manager.ts";
+import { DiscordGetReactionsParams, UserPayload } from "../../types/mod.ts";
+import { Collection } from "../../util/collection.ts";
+import { endpoints } from "../../util/constants.ts";
+
+/** Get a list of users that reacted with this emoji. */
+export async function getReactions(
+  channelID: string,
+  messageID: string,
+  reaction: string,
+  options?: DiscordGetReactionsParams,
+) {
+  const users = (await RequestManager.get(
+    endpoints.CHANNEL_MESSAGE_REACTION(channelID, messageID, reaction),
+    options,
+  )) as UserPayload[];
+
+  return new Collection(users.map((user) => [user.id, user]));
+}