Add batch video statistics retrieval method that fetches view counts,
like counts, and comment counts for up to 50 videos per request.
Includes unit tests covering normal operation, empty input, missing
statistics defaults, null API response, and error propagation.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add youtube.upload and yt-analytics.readonly scopes to enable video
uploading and analytics data retrieval in the YouTube Operations Hub.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
