Handling GitHub rate limiting with bot-rerun requests

Based on discussion with @CJ-Wright in PR ( https://github.com/conda-forge/cupy-feedstock/pull/1 ), it sounds like the bot runs into some issues with GitHub rate limiting when handling `bot-rerun` requests. Ideally it would be good for the bot to be more webservice-like by using GitHub actions (or similar) to handle these labeling events when they occur. Though it would also be reasonable near term for the bot to keep track of where it runs into GitHub rate limiting so it can resume next time at the same spot.