Internal design doc: http://go/flutter-update-packages-autoroller

Steps:

• Implement autoroll script in flutter/flutter Add update packages roller #100982
• Upload gh cli tool to cipd
• Generate GitHub access token reguest for github access token for pub package autoroller bot #106527
• Create a new recipe to run the autoroll script https://flutter-review.googlesource.com/c/recipes/+/31620
• Create a new builder, with access to the gh cipd package and github access token [flutter_tools] add packages_autoroller to .ci.yaml as bringup #106711
• Have script add "autosubmit" label and have cocoon auto approve

Nice to haves:

• PR description body with summary of changes: [flutter_tools] Have pub roller bot create a PR description with summary of changes #106838

Query of merged autoroll PRs: https://github.com/flutter/flutter/pulls?q=is%3Apr+author%3Afluttergithubbot+is%3Amerged+%22Roll+pub+packages%22