Feature request: Add support for @backoff instead @retry

[sr-standards]

Feature request: Add support for @backoff instead @Retry

Langchain currently uses the @Retry decorator to retry the API call in case of a RateLimitError. Using @backoff.on_exception, from the backoff package works better. Because the time in-between retries increases exponentially. This is a feature request to add support for @backoff.