Add Gemini-backed multi-channel video watcher#2

Timon0512 wants to merge 9 commits intocheck_for_new_videosTimon0512/YoutTubeSummarizer:check_for_new_videosfrom

codex/create-new_video_check.py-with-required-functionsTimon0512/YoutTubeSummarizer:codex/create-new_video_check.py-with-required-functionsCopy head branch name to clipboard