Configure CodeRabbit review

[ykmr1224]

Configure CodeRabbit to review PRs automatically, and establish feedback loop.

If you see issue with review by coderabbitai, comment to this issue.

[penghuo]

Suggestions

1. Remove Suggested reviewers.
2. Remove Poem.

[ykmr1224]

1. Remove Suggested reviewers.
2. Remove Poem.

Fixed in #4901

[ykmr1224]

Added feedback reminder in #4932
Will come up with analyzer to collect metrics.

[LantaoJin]

Will CodeRabbit review after each commit (not a draft RP)? Can we change it to only review the code when all CI passed.

[ykmr1224]

Will CodeRabbit review after each commit (not a draft RP)? Can we change it to only review the code when all CI passed.

Seems CodeRabbit doesn't have such feature by itself. We'd need to manually hook the workflow completion and request review.