refactor: remove RequestManager and use runMethod() (#732)

* fix(rest/process_request): use DiscordHTTPResponseCodes

* refactor: remove RequestManager

* refactor: remove RequestManager and use runMethod()

src/helpers/templates/edit_guild_template.ts

@@ -1,4 +1,4 @@
-import { RequestManager } from "../../rest/request_manager.ts";
+import { rest } from "../../rest/rest.ts";
 import { structures } from "../../structures/mod.ts";
 import { endpoints } from "../../util/constants.ts";
 import { requireBotGuildPermissions } from "../../util/permissions.ts";
@@ -22,10 +22,12 @@ export async function editGuildTemplate(
     throw new Error("The description can only be in between 0-120 characters.");
   }
 
-  const template = (await RequestManager.patch(
-    `${endpoints.GUILD_TEMPLATES(guildId)}/${templateCode}`,
-    data,
-  )) as GuildTemplate;
+  const template =
+    (await rest.runMethod(
+      "patch",
+      `${endpoints.GUILD_TEMPLATES(guildId)}/${templateCode}`,
+      data,
+    )) as GuildTemplate;
 
   return structures.createTemplateStruct(template);
 }