feat: update OAuth2 authorization options and add method warnings for deprecated functionality

src/errors/Messages.js

@@ -209,6 +209,9 @@ const Messages = {
   STREAM_CANNOT_JOIN: 'Cannot join a stream to itself',
   VOICE_USER_NOT_STREAMING: 'User is not streaming',
   POLL_ALREADY_EXPIRED: 'This poll has already expired.',
+  INVALID_OAUTH_OPTIONS: 'Invalid options for authenticating with OAuth2.',
+  METHOD_WARNING:
+    'This method is flagged as it may lead to a temporary or permanent account ban. Do not use until further notice.',
 };
 
 for (const [name, message] of Object.entries(Messages)) register(name, message);