Build notification bot to notify the commit author if their change is breaking trunk

[huydhn]

This is an action item coming out of https://fburl.com/gdoc/oppetklz. When a commit break trunk, we want to have a bot to notify the commit author about the issue, for example, commenting on the pull request and cc the author.

Notes to bootcampers:

• A ClickHouse query is likely needed to decided if a failure is breaking trunk or just flaky. A broken trunk failure is defined as failing in trunk N consecutive times
  • torchci/clickhouse_queries/flaky_workflows_jobs/query.sql is an example on how to flaky failures
• Ask me or @clee2000 to grant you access to https://clickhouse.com
• PyTorch bot code is at https://github.com/pytorch/test-infra/tree/main/torchci/lib/bot
• Bonus point is to be able to submit a reverted PR to gather its signals