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

* fix(rest/process_request): use DiscordHTTPResponseCodes

* refactor: remove RequestManager

* refactor: remove RequestManager and use runMethod()

src/helpers/channels/edit_channel.ts

@@ -1,4 +1,4 @@
-import { RequestManager } from "../../rest/request_manager.ts";
+import { rest } from "../../rest/rest.ts";
 import { endpoints } from "../../util/constants.ts";
 import {
   calculateBits,
@@ -56,10 +56,14 @@ export async function editChannel(
     }),
   };
 
-  const result = await RequestManager.patch(endpoints.CHANNEL_BASE(channelId), {
-    ...payload,
-    reason,
-  });
+  const result = await rest.runMethod(
+    "patch",
+    endpoints.CHANNEL_BASE(channelId),
+    {
+      ...payload,
+      reason,
+    },
+  );
 
   return result;
 }